Smart Productions

Challenge Lesson 8 Source Code

2011-05-16T15:02:00.000-07:00


List of videos Challenge 1

First Challenge

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Solution 1

#include <iostream>
using namespace std;

int main()
{
	double base = 0;
	double height = 0;
	double Rectangle_Area = 0;
	double Triangle_Area = 0;

	cout << "Type in a length of a rectangle: ";
	cin >> base;
	cout << "Type in a height of a rectangle: ";
	cin >> height;
	Rectangle_Area = base*height;

	cout << "Type in a length of a triangle: ";
	cin >> base;
	cout << "Type in a height of a triangle: ";
	cin >> height;
	Triangle_Area = base*height/2;

	cout << endl << "Area of Rectangle: " << Rectangle_Area << endl
	<< "Area of Triangle: " << Triangle_Area << endl <<
	"Sum of area: " << Rectangle_Area + Triangle_Area << endl;
	system("pause");
}



Solution 2

#include <iostream>
using namespace std;

int main()
{
	double Rectbase = 0;
	double Rectheight = 0;
	double Tribase = 0;
	double Triheight = 0;

	cout << "Type in a length of a rectangle: ";
	cin >> Rectbase;
	cout << "Type in a height of a rectangle: ";
	cin >> Rectheight;

	cout << "Type in a length of a triangle: ";
	cin >> Tribase;
	cout << "Type in a height of a triangle: ";
	cin >> Triheight;

	cout << endl;
	cout << "Area of Rectangle: " << Rectbase*Rectheight 	<< endl;
	cout << "Area of Triangle: " << Tribase*Triheight/2 	<< endl;
	cout << "Sum of area: " << Rectbase*Rectheight+Tribase*Triheight/2
	<< endl;
	system("pause");
}

Lesson 11 Source Code

2011-05-10T20:19:00.001-07:00

List of videos Lesson 11 Video

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Lesson 11: Introduction to the if statement

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if statements


The if statement will only take bool parameter (value inside the paranthesis).
The if statement will either skip or execute the following program statement depending on the boolean value of the if statement.
Run both of these pieces of code. refer to the video for the detailed explanation.
#include <iostream>
using namespace std;

int main()
{
 if(true)
 cout << "my name is iam4eversmart88" << endl;
 cout << "what is your name";
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 if(false)
 cout << "my name is iam4eversmart88" << endl;
 cout << "what is your name";
 cin.get();
 return 0;
}


the if statement can also refer to code blocks (code inside curly braces) to skip multiple lines of code.
#include <iostream>
using namespace std;

int main()
{
 if(false)
 {
  cout << "my name is iam4eversmart88" << endl;
  cout << "what is your name";
 }
 cin.get();
 return 0;
}


you can input variables into th if parameter.
You can also put in int, double, char, etc types but don't forget the rules of the boolean values that aren't true or false.
#include <iostream>
using namespace std;

int main()
{
 bool Boolean=true;
 if(Boolean)
 {
  cout << "my name is iam4eversmart88" << endl;
  cout << "what is your name";
 }
 cin.get();
 return 0;
}


Here are slightly more practical examples that might help you see why if statements are useful
#include <iostream>
using namespace std;

int main()
{
 bool Boolean=true;
 float x=6.1;
 if(Boolean)
 {
  x=999.1;
 }
 cout << x;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 bool Boolean=false;
 float x=6.1;
 if(Boolean)
 {
  x=999.1;
 }
 cout << x;
 cin.get();
 return 0;
}

Lesson 20 Source Code

2011-04-26T09:46:00.001-07:00

List of videos Lesson 20 Video

Lesson 20: The while loop part 3: break statement

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A prime number algorithm


Here is an infinite loop that we have encountered in the past. This is a bug that can be very difficult to find.
#include <iostream>
using namespace std;

int main()
{
 int count=0;
 while(true)
 {
  cout << count << endl;
  count++;
 }
 system("pause");
 return 0;
}


We can add a condition in the while loop parameter that changes each time by using a counting variable.
#include <iostream>
using namespace std;

int main()
{
 int count=0;
 while(count < 10)
 {
  cout << count << endl;
  count++;
 }
 system("pause");
 return 0;
}



Prime number algorithm


In this program, you will enter a positive Integer value for a, and it will tell you if that number is prime or not
#include <iostream>
using namespace std;

int main()
{
 int a, n=2;

 cout << "Enter a number for a: ";
 cin >> a;
 while(n<=a)
 {
  if(n==a)
  {
   cout << a << " is Prime!\n";
   break;
  }
  if(a%n==0)
  {
   cout << a << " is Divisible by" << n << endl;
   break;
  }
  n=n+1;
 }
 system("pause");
 return 0;
}


Here is the algorithm that prints off many prime numbers to the screen. Just enter an Integer value for x and it will print off that 

many random numbers.
#include <iostream>
using namespace std;

int main()
{
 int a=2, n=2, x;

 cout << "Enter a number for x: ";
 cin >> x;
 while(a<=x)
 {
  while(n<=a)
  {
   if(n==a)
   {
    cout << a << " is Prime!\n";
    break;
   }
   if(a%n==0)
   {
    cout << a << " is Divisible by" << n << endl;
    break;
   }
   n=n+1;
  }
  a++;
  n=2;
 }
 system("pause");
 return 0;
}

from 2 to x is the range of values that will be printed. a is the variable we are testing to see if its prime or not. n is the divisor 

that determines if it really is prime or not.

Notice that when you escape from the second while loop, n has to be set back equal to 2 because in the we need to start off dividing the 

next number by 2 just as we have been doing for the first number.

Lesson 16 Source Code

2011-04-26T08:42:00.001-07:00

List of videos Lesson 16 Video

Lesson 16: The while loop

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beginning while loop examples

This will print my name 5 times to the screen
#include <iostream>
using namespace std;

int main()
{
 int a=0;
 while(a<5)
 {
  cout << "iam4eversmart88" << endl;
  a = a + 1;
 }
 cin.get();
 return 0;
}


This program code will count from 0 to 24 
#include <iostream>
using namespace std;

int main()
{
 int a=0;
 while(a<25)
 {
  cout << a << endl;
  a = a + 1;
 }
 cin.get();
 return 0;
}


This program will NEVER END. This is a common bug called the infinite loop 
#include <iostream>
using namespace std;

int main()
{
 int a=0;
 while(a<=500)
 {
  cout << a << endl;
  a = 2*a;
 }
 cin.get();
 return 0;
}


This program will double the value of "a" and print it out to the screen until a is greater than 500
(NOTE: There is only 1 difference compared to the program above this one)
#include <iostream>
using namespace std;

int main()
{
 int a=1;
 while(a<=500)
 {
  cout << a << endl;
  a = 2*a;
 }
 cin.get();
 return 0;
}


This program will dived a by 2 each time until a is 0;
#include <iostream>
using namespace std;

int main()
{
 int a=1000000;
 while(a>0)
 {
  cout << a << endl;
  a = a/2;
 }
 cin.get();
 return 0;
}

Lesson 10 Source Code

2011-04-24T08:42:00.001-07:00

List of videos Lesson 10 Video

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Lesson 10: The bool (Boolean) type

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small char programs


Boolean types can hold either true or false
#include <iostream>
using namespace std;

int main()
{
 bool smart=true;
 cout << smart;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 bool smart=false;
 cout << smart;
 cin.get();
 return 0;
}


If the value is set a number that is not equal to 0 the boolean value will be set to true
#include <iostream>
using namespace std;

int main()
{
 bool smart=13;
 cout << smart;
 cin.get();
 return 0;
}


If the value is set to 0, the boolean value will be considered false.
#include <iostream>
using namespace std;

int main()
{
 bool smart=0;
 cout << smart;
 cin.get();
 return 0;
}

Lesson 9 Source Code

2011-04-24T07:36:00.001-07:00

List of videos Lesson 9 Video

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Lesson 9: The char type

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small char programs


The char can only hold ONE character. that character has to be inside single quotations.
#include <iostream>
using namespace std;

int main()
{
 char character = 't';

 cout << character;

 cin.get();
 return 0;
}


Initializing and assigning multiple variables
#include <iostream>
using namespace std;

int main()
{
 char character = 't', ch2='~', ch3='|';

 cout << character << endl << ch2 << endl << ch3;

 cin.get();
 return 0;
}

Lesson 8 Source Code

2011-04-22T20:53:00.001-07:00

List of videos Lesson 8 Video

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Lesson 8: The cin statement

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The cin statement


The cin statement allows the user to enter a value for x in this example
#include <iostream>
using namespace std;

int main()
{
 int x=6;
 cout << "Enter an integer value: ";
 cin >> x;
 cout << "you have entered " << x << endl;
 system("pause");
 return 0;
}

notice that the cin.get() statement is replaced by the system("pause") because the cin.get() will not work once cin has been called. (i 

don't know why that is the case)

Here is another example. Computers don't like to divide by zero, you can try to input 0 for y to see what happens or you can also find 

out what happens by watching the video.
#include <iostream>
using namespace std;

int main()
{
 int x;
 int y;
 cout << "Enter a dividend: ";
 cin >> x;
 cout << "Enter a divisor: ";
 cin >> y;
 cout << "The quotient is " << x/y << " with a remainder of " << x%y << endl;
 system("pause");
 return 0;
}

Lesson 15 Source Code

2011-04-22T20:25:00.001-07:00

List of videos Lesson 15 Video

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Lesson 15: Increment and Decrement part 1

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Examples of incrementing and decrementing


The vale on the right of the assignment operator ("=") will ALWAYS be the new value of the variable that is on the left hand sign of the assignment operator. 

(Don't forget there can be only one variable on the left side of the assignment operator.
#include <iostream>
using namespace std;

int main()
{
 int rocks=5, coins=71;
 coins = rocks + 3;
 cout << coins;
 cin.get();
 return 0;
}


The same rules still apply... The vale on the right hand side of the assignment operator will be the new value of the left hand side
#include <iostream>
using namespace std;

int main()
{
 int rocks=5, coins=71;
 coins = coins + 3;
 cout << coins;
 cin.get();
 return 0;
}


Here is a larger example of how to apply the increment and decrement technique.
#include <iostream>
using namespace std;

int main()
{
 int rocks=5, coins=71;
 char choice = 'b';
 cout << "would you like to buy a rock for 1 coin? ";
 cin >> choice;
 if(choice == 'y')
 {
  coins = coins - 1;
  rocks = rocks + 1;
  cout << "Thankyou!";
 }
 else
 {
  cout << "Thats too bad";
 }
 cout << coins;
 system("pause");
 return 0;
}

Lesson 7 Source Code

2011-04-22T19:43:00.001-07:00

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Lesson 7: the float and double types

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Examples of the float types

The float type will display up to six significant figures
#include <iostream>
using namespace std;

int main()
{
 float weight = 2.2468481268548972;
 cout << weight;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 float weight = 295.2468481268548972;
 cout << weight;
 cin.get();
 return 0;
}


The value will be dislayed in scientific notation when necessary.
#include <iostream>
using namespace std;

int main()
{
 float weight = 548123846512354;
 cout << weight;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 float weight = .00000000054812358;
 cout << weight;
 cin.get();
 return 0;
}


The float type will display 20 million in scientific notation but the the int type will not.
#include <iostream>
using namespace std;

int main()
{
 float weight = 20000000;
 cout << weight;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 int weight = 20000000;
 cout << weight;
 cin.get();
 return 0;
}


float types do not store a lot of significant figures. Look at this code carefully. The last number printed to the screen should be 0.2 

but you will get 0.1875 when its compiled.
#include <iostream>
using namespace std;

int main()
{
 float weight = 300000.1;
 float z = 300000.1;
 float total = weight + z;
 cout << weight;
 cout << endl << total - 600000;
 cin.get();
 return 0;
}



Examples of the float types
A better version of the float type (recommended)

Now compile this code.. The correct result is displayed after changing the float types to double types.
#include <iostream>
using namespace std;

int main()
{
 double weight = 300000.1;
 double z = 300000.1;
 double total = weight + z;
 cout << weight;
 cout << endl << total - 600000;
 cin.get();
 return 0;
}

Lesson 6 Source Code

2011-04-22T19:29:00.001-07:00

List of videos Lesson 6 Video

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Lesson 6: Mathematical Operators

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Example of the mathematical operators

Here are examples on how to apply the the addition, subtraction and multiplication.
#include <iostream>
using namespace std;

int main()
{
	int apples = 30;
	int oranges = 40;

	cout << apples + oranges;

	cin.get();
	return 0;
}
 #include <iostream>
using namespace std;

int main()
{
 int apples = 30;
 int oranges = 40;

 cout << apples - oranges;

 cin.get();
 return 0;
}
 #include <iostream>
using namespace std;

int main()
{
 int apples = 30;
 int oranges = 40;

 cout << apples * oranges;

 cin.get();
 return 0;
}


The division operator outputs different results depending on the variable type.
#include <iostream>
using namespace std;

int main()
{
 int apples = 110;
 int oranges = 40;

 cout << apples / oranges;

 cin.get();
 return 0;
}

Although 110/40 is 2.75, because these were all integer types, the result will ignore the decimal values and will use 2 as the value.

The float type stores decimal values and can be used to approximate values. (There is a better type to use other than float in the next 

lesson)
#include <iostream>
using namespace std;

int main()
{
 float apples = 110;
 float oranges = 40;

 cout << apples / oranges;

 cin.get();
 return 0;
}


If you use arithmetic with an int type and a float type, the result will be of the type float.
#include <iostream>
using namespace std;

int main()
{
 float apples = 110;
 int oranges = 40;

 cout << apples / oranges;

 cin.get();
 return 0;
}


The mod ("%") operator is used for finding the remainder of a quotient. The mod operator can only be used for int types only.
#include <iostream>
using namespace std;

int main()
{
 int x = 7;
 int y = 3;

 cout << x%y;

 cin.get();
 return 0;
}


Here is an example on how to ask a second grader the quotient of two integer values.
#include <iostream>
using namespace std;

int main()
{
 int x = 129;
 int y = 5;

 cout << "The quotient is " << x/y << " with a remainder of " << x%y;

 cin.get();
 return 0;
}

Lesson 5 Source Code

2011-04-22T19:28:00.001-07:00

There is no lesson 5 source code

List of videos Lesson 5 Video

Lesson 4 Source Code

2011-04-22T19:27:00.001-07:00

List of videos Lesson 4 Video

To get the full benefit of the lesson, watch the video

Lesson 4: Variables part 2: Assigning variables

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A little more on Declaring and assigning variables


The main emphasis on this video is ONE AND ONLY ONE VARIABLE will go onthe left hand side of the assignment operator (=) while any other expression can go on the right hand side.The value on the right hand side will be the new value of the ONE varibale on the left hand side.
#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;
 cout << "There are " << fruit << " fruit" << endl;
 cin.get();
 return 0;
}

Variables can be re-assigned a different value throughout different points of the program.
#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 
 apples = 12;

 cout << "There are " << apples << " apples" << endl;
 cin.get();
 return 0;
}

#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;

 apples = oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;
 cin.get();
 return 0;
}
In this example, apples and oranges will be equal to 29 because the value of the right hand side of the assignment operator

#include <iostream>
using namespace std;

int main()
{
 int apples;
 apples = 19;
 int oranges;
 oranges = 29;
 int fruit = apples + oranges;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;

 oranges = apples;

 cout << "There are " << apples << " apples" << endl;
 cout << "There are " << oranges << " oranges" << endl;
 cin.get();
 return 0;
}
In this example, apples and oranges will be equal to 29 because the value of the right hand side of the assignment operator

Lesson 3 Source Code

2011-04-22T19:25:00.001-07:00

List of videos Lesson 3 Video

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Lesson 3: Variables part 1: Declaring variables

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Declaring a couple of Integer type variables

#include <iostream>
using namespace std;

int main()
{
	int apples;
	apples=3;
	int oranges;
	oranges=5;
	cout << "There are " << oranges << " oranges";
	cout << endl;
	cout << "There are " << apples << " apples";
	cin.get();
	return 0;
}

Lesson 2 Source Code

2011-04-22T19:24:00.001-07:00

List of videos Lesson 2 Video

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Lesson 2: The cout statement

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Basic use of the cout statement

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World";
	cout << endl;
	cout << "my name is iam4eversmart88";
	cin.get();
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World" << endl << "my name is iam4eversmart88";
	cin.get();
	return 0;
}



more examples of the same thing

The point of these examples is to show you that white space really doesn't matter too much about white space.

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World"
	<< endl 
 
	<<
	"my name is iam4eversmart88";

	cin.get();
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	cout 
	<< "Hello World"
	<< endl; 
 
	cout <<
	"my name is iam4eversmart88";

	cin.get();
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World"
	<< endl; cout <<
	"my name is iam4eversmart88";

	cin.get();
	return 0;
}

Lesson 1 Source Code

2011-04-22T19:23:00.001-07:00

List of videos Lesson 1 Video

Lesson 1: Write your first program here

To get the full benefit of the lesson, watch the video

NOTE: for a fast copy, follow these steps in order:
Click anywhere in the text box below (result will be a blinking vertical line in the text box)
Hit ctrl + A on the key board (the "ctrl + A" means hit Ctrl and A at the same time)
(The result should be that all the text inside the text box lights up in blue)
Hit Ctrl + C (Nothing significantly happens that is visible) and now its copied to the clipboard and your ready to paste it anywhere you wish



The Classic Hello World Program

#include <iostream>
using namespace std;

int main()
{
	cout << "Hello World";
	cin.get();
	return 0;
}

Detailed C++ Video Tutorials

2011-02-15T20:54:00.000-08:00

Youtube Channel

The Links column has the links that link you to the corresponding video from the video column. the C link will open up the video in the currnet tab and the N link will open up the video in a new tab but either way, you will be in the same place.

The Extension column has links the Extended videos, if you plan on following all the videos in order, the extended lessons are required to be watched to get the full benefit of the lesson. I put extension videos because i either left something out that was important, or i go over things that can go wrong and will show you how to trouble shoot certain issues

The Add-Ons column has links to the videos that are not required to be watched to recieve the full benefit of the C++ lessons, the code in these videos will not be explained in full detail. These are off-topic videos that are FYI and FYE (for your entertainment) and i think they are pretty interesting topics

The Source code column has links to the source code described in the corresponding video, that way you can copy and paste the code and re-edit it or do whatever you want with it.

The Challenge column has a video link (which is the V link) that shows you the running version of a program and you must try and write the code for it that does the same exact thing. Hopefully you can figure out a solution but if you can't, click on the S which provides you with a solution (sometimes more than one). There are many different ways to solve a problem

Title	links	Extensions	Add-ons	Source code	Challenges
Lesson 0: Installing Visual C++ 2010 Express	C N			N/A
Lesson 1: Write your first program here	C N	E1		S
Lesson 2: The cout statement	C N			S
Lesson 3: Variables part 1: Declaring variables	C N			S
Lesson 4: Variables part 2: Assigning variables	C N			S
Lesson 5: Naming variables	C N			N/A
Lesson 6: Mathematical Operators	C N			S
Lesson 7: the float and double types	C N			S
Lesson 8: The cin statement	C N			S	V S
Lesson 9: The char type	C N			S
Lesson 10: The bool (Boolean) type	C N			S
Lesson 11: Introduction to the if statement	C N			S
Lesson 12: Relational operators	C N
Lesson 13: Different Variable types	C N
Lesson 14: If else statement	C N
Lesson 15: Increment and Decrement part 1	C N			S
Lesson 16: The while loop	C N			S
Lesson 17: Increment and Decrement part 2	C N
Lesson 18: Logial operators	C N	E1
Lesson 19: The while loop part 2	C N
Lesson 20: The while loop part 3: break statement	C N			S
Lesson 21: Variables part 3: Data types & ASCII	C N	E1
Lesson 22: Random Numbers and intro to Libraries	C N
Lesson 23: Introduction to Arrays	C N		A1
Lesson 24: Applying random numbers	C N
Lesson 25: First game explained in detail	C N
Lesson 26: Continuing from Lesson 25	C N		A1
Lesson 27: Arrays	C N
Lesson 28: Arrays part 2 max/min example	C N
Lesson 29: Arrays part 3	C N
Lesson 30: The for loop	C N
Lesson 31: Random number errors	C N
Lesson 32: Non-repeating random numbers part 1	C N
Lesson 33: Non-repeating random numbers part 2	C N
Lesson 34: Introduction to Scope Visibility	C N
Lesson 35: More Scope Visibility	C N
Lesson 36: Introduction to functions	C N			S
Lesson 37: Function Parameters & Return value	C N			S
Lesson 38: Applying functions	C N			S
Lesson 39: Applying functions part 2	C N
Lesson 40: Applying functions part 3	C N
Lesson 41: Function prototypes	C N
Lesson 42: Header files	C N
Lesson 43: Intro to libraries	C N
Lesson 44: ctime library (1)	C N
Lesson 45: string library (1)	C N
Lesson 46: Global variables	C N
Lesson 47: Brief Constructor and Destructor	C N
Lesson 48: Memory addresses	C N
Lesson 49: Intro to Pointers	C N
Lesson 50: Pointers part 2: the use of pointers	C N
Lesson 51: Pointers part 3: dangers of pointers	C N