Sheger Tech

Let us install Java

noreply@blogger.com (Josh) — Mon, 30 Oct 2017 10:50:00 +0000

To write a java program, you need to install the java tools on your machine. Below, I've prepared the minimum system requirements for installing java on your system and the tools required to write a java program.

Minimum System Requirements

Windows

Windows 10 (8u51 and above)
Windows 8.x (Desktop)
Windows 7 SP1
Windows Vista SP2
Windows Server 2008 R2 SP1 (64-bit)
Windows Server 2012 and 2012 R2 (64-bit)
RAM: 128 MB
Disk space: 124 MB for JRE; 2 MB for Java Update
Processor: Minimum Pentium 2 266 MHz processor
Browsers: Internet Explorer 9 and above, Firefox

Mac OS X

Intel-based Mac running Mac OS X 10.8.3+, 10.9+
Administrator privileges for installation
64-bit browser
A 64-bit browser (Safari, for example) is required to run Oracle Java on Mac.

Linux

Oracle Linux 5.5+¹
Oracle Linux 6.x (32-bit), 6.x (64-bit)²
Oracle Linux 7.x (64-bit)² (8u20 and above)
Red Hat Enterprise Linux 5.5+¹, 6.x (32-bit), 6.x (64-bit)²
Red Hat Enterprise Linux 7.x (64-bit)² (8u20 and above)
Suse Linux Enterprise Server 10 SP2+, 11.x
Suse Linux Enterprise Server 12.x (64-bit)² (8u31 and above)
Ubuntu Linux 12.04 LTS, 13.x
Ubuntu Linux 14.x (8u25 and above)
Ubuntu Linux 15.04 (8u45 and above)
Ubuntu Linux 15.10 (8u65 and above)
Browsers: Firefox

After meeting one of the above platform requirements, we will have to install the following java tools.

Java Tools

Java Development Kit(JDK)

JDK 8

Java Integrated Development Environment(IDE)

IntelliJ IDEA or Eclipse or NetBeans

Simple Text Editor

Notepad or Notepad++

Watch the below tutorial that shows you how to download and install JDK8, IntelliJ IDEA and Notepad++.

Features of the java programming language

noreply@blogger.com (Josh) — Mon, 30 Oct 2017 08:22:00 +0000

Java is an object oriented programming language. In Java, everything is an object. Java can be easily extended since it is based on the object model.

Java is platform independent. Unlike many other programming languages including C and C++, when Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual machine(JVM) on whichever platform it is being run.

Java is simple. Java is designed to be easy to learn. If you understand the basic concept of OOP Java would be easy to master.

Java is secure. With Java's secure feature it enables to develop virus-free, tamper-free systems. Authentication techniques are based on public-key encryption.

Java is architectural-neutral. Java compiler generates an architecture-neutral object file format which makes the compiled code to be executable on many processors, with the presence of Java runtime system.

Java is portable. Being architectural-neutral and having no implementation dependent aspects of the specification makes Java portable. Compiler in Java is written in ANSI C with a clean portability boundary which is a POSIX subset.

Java is robust. Java makes an effort to eliminate error prone situations by emphasizing mainly on compile time error checking and runtime checking.

Java is multithreaded. With Java's multithreaded feature it is possible to write programs that can do many tasks simultaneously. This design feature allows developers to construct smoothly running interactive applications.

Java is interpreted. Java byte code is translated on the fly to native machine instructions and is not stored anywhere. The development process is more rapid and analytical since the linking is an incremental and light weight process.

Java enables high performance. With the use of Just-In-Time compilers, Java enables high performance.

Java is distributed. Java is designed for the distributed environment of the internet.

Java is dynamic. Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time.

Introduction to Java

noreply@blogger.com (Josh) — Mon, 30 Oct 2017 08:16:00 +0000

Java was originally developed by Sun Microsystems(which has since been acquired by Oracle Corporation) which was initiated by James Gosling and released in 1995 as a core component of Sun Microsystems Java Platform(Java 1.0 [J2SE]).

The language derives much of its syntax from C and C++, but it has fewer low-level facilities than either of them.

The latest release of the Java Standard Edition is Java SE 8 as of 2017.

With the advancement of Java and its widespread popularity, multiple configurations were built to suite various types of platforms. Ex: J2EE for building enterprise applications, J2ME for programming mobile wireless devices and J2SE for building desktop applications.

The new J2 versions were renamed as Java SE, Java EE and Java ME.

Java is guaranteed to be Write Once, Run Anywhere(WORA).

Write a java program that finds and stores the factorials of numbers between and including 3 and 10 in an array and calculates the average of the factorials from the array.

noreply@blogger.com (Josh) — Mon, 28 Aug 2017 16:19:00 +0000

/*
For more exercises,
visit shegertech.blogspot.com
or
shegertech.com
Author: Eyasu M.
Email: eyasu@india.com
*/

public class FactorialAverage {
    public static void main(String[] args) {
        int factorial;
        double sum = 0;
        int[] x = new int[8];
        for (int i = 3, k = 0; i <= 10; i++, k++) {
            factorial = 1;
            for (int y = 1; y <= i; y++) {
                factorial *= y;
            }
            x[k] = factorial;
            sum += x[k];
        }
        System.out.println(sum / x.length);
    }
}

Output

Write a program that calculates and displays the average of odd perfect squares from the following array values. {1,5,4,6,9,11,16,19,25,35,36,39,42,49,50}

noreply@blogger.com (Josh) — Wed, 09 Aug 2017 20:34:00 +0000

/*
For more exercises,
visit shegertech.blogspot.com
or
shegertech.com

Author: Eyasu M.
Email: eyasu@india.com
*/

#include <iostream>
using namespace std;

int count;
double sum;

void squareRootChecker(int x[], int size){
bool flag = false;

for(int y=0;y<size;y++){
for(int i=1;i<x[y];i++){
if(i*i == x[y] && x[y]%2!=0){
sum+=x[y];
count++;
}
}
}
}

int getCount(){
return count;
}

double getSum(){
return sum;
}

double getAverage(){
double average = getSum()/getCount();
return average;
}

int main(){

int x[15]={1,5,4,6,9,11,16,19,25,35,36,39,42,49,50};

squareRootChecker(x, 15);

cout<<"The average of the odd perfect squares from the array values is "<<getAverage()<<endl;

return 0;
}

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Output

Write a c++ program that tells the user whether a number is a perfect square or not.

noreply@blogger.com (Josh) — Wed, 09 Aug 2017 20:10:00 +0000

/*
For more exercises,
visit shegertech.blogspot.com
or
shegertech.com

Author: Eyasu M.
Email: eyasu@india.com
*/

#include <iostream>
using namespace std;

int main(){

int x=0;
bool flag = false;

cout <<"Enter a number : ";
cin>>x;

cout<<endl;

for(int i=1;i<x;i++){
if(i*i == x){
flag= true;
}

}
if(flag){
cout<<"Bingo ! "<<x <<" is a perfect square."<<endl;
}
else{
cout<<x<<" is not a perfect square."<<endl;
}

return 0;
}

noreply@blogger.com (Josh) — Wed, 09 Aug 2017 05:15:00 +0000

Coming Soon !

Top 7 websites to download or watch full Hollywood movies absolutely for free

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 09:32:00 +0000

Are you fond of watching online movies? Do you spend a lot of time surfing the net in order to find new exciting movies and top rated movies? Rejoice, because I have compiled and prepared a list of websites that will allow you to easily download or watch your desired movies for free.

Here are the top 7 websites to watch and download movies for free.

1. Putlocker

2. House Movie

3. Solar Movie

4. Movie Watcher

5. Watch Free

6. B Movies

7. X Movies

Modify the solution of exercise 1 in order to print the elements of the array in reverse order using a pointer.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:20:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include<iostream>
#include<conio.h>

using namespace std;

int main()
{
int arr[5],i;
int *p=arr;
cout<<"Enter five numbers separated by space:";
cin>>*p>>*(p+1)>>*(p+2)>>*(p+3)>>*(p+4);
cout<<"Your numbers are:\n";
for(i=4;i>=0;i--)
cout<<*(p+i)<<endl;

getch();
return 0;

}

Write a C++ program to accept five integer values from keyword. The five values will be stored in an array using a pointer. Then print the elements of the array on the screen.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:20:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include<iostream>
#include<conio.h>

using namespace std;

int main()
{
int arr[5],i;
int *p=arr;
cout<<"Enter five numbers separated by space:";
cin>>*p>>*(p+1)>>*(p+2)>>*(p+3)>>*(p+4);
cout<<"Your numbers are:\n";
for(i=0;i<5;i++)
cout<<arr[i]<<endl;

getch();
return 0;

}

Write a program that checks whether a string is palindrome or not.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:19:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <iostream>
#include <cstring>
using namespace std;

int main(){
char string1[20];
int i, length;
int flag = 0;

cout << "Enter a string: "; cin >> string1;

length = strlen(string1);

for(i=0;i < length ;i++){
if(string1[i] != string1[length-i-1]){
flag = 1;
break;
}
}

if (flag) {
cout << string1 << " is not a palindrome" << endl;
}
else {
cout << string1 << " is a palindrome" << endl;
}
system("pause");
return 0;
}

Write a function named "g_c_d" that takes two positive integer arguments and returns as its value the greatest common divisor of those two integers. If the function is passed an argument that is not positive (i.e., greater than zero), then the function should return the value 0 as a sentinel value to indicate that an error occurred.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:18:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <iostream>
#include <cstdlib>
using namespace std;

int g_c_d (int a, int b)
{
if (a <= 0 || b <= 0) // a parameter is not positive
return 0; // exit and return the error sentinel
int trial_divisor;
trial_divisor = ( a <= b ? a : b ); // set it to the smaller
while (a % trial_divisor != 0 || b % trial_divisor != 0)
--trial_divisor;
return trial_divisor;
}

int main(){
int n1=12, n2=30;
cout<<g_c_d(n1, n2)<<endl;
system("pause");
return EXIT_SUCCESS;
}

Write a function named "enough" that takes one integer argument, call it "goal" and returns as its value the smallest positive integer n for which 1+2+3+. . . +n is at least equal to goal .

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:17:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <iostream>
#include <cstdlib>
using namespace std;

int enough (int goal)
{
int n = 1, sum = 1;
while (sum < goal)
sum += ++n;
return n;
}

int main(){
int n2=5;
cout<<enough(n2)<<endl;
system("pause");
return EXIT_SUCCESS;
}

Write a function named "sum_from_to" that takes two integer arguments, call them "first" and "last", and returns as its value the sum of all the integers between first and last inclusive.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:17:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <iostream>
#include <cstdlib>
using namespace std;

int sum_from_to (int first, int last)
{
int i, partial_sum = 0;
if (first <= last)
for (i = first; i <= last; ++i)
partial_sum += i;
else
for (i = first; i >= last; --i)
partial_sum += i;
return partial_sum;
}

int main(){

int n1=2, n2=5;
cout<<sum_from_to(n1, n2)<<endl;
system("pause");
return EXIT_SUCCESS;
}

Write a guess number game.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:15:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <stdlib.h>
#include <iostream>
#include <time.h>
using namespace std;

int main()
{
srand(time(NULL));
int number=rand()%100;
int guess=-1;
int trycount=0;
while(guess!=number && trycount<8)

{
cout<<"Please enter a guess: ";
cin>>guess;

if(guess<number)
cout<<"Too low"<<endl;

if(guess>number)
cout<<"Too high"<<endl;

trycount++;
}
if(guess==number)
cout<<"You guessed the number";
else
cout<<"Sorry, the number was: "<<number;
return 0;
}

Write a program that will ask the user to input three integer values from the keyboard. Then it will print the smallest and largest of those numbers.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:14:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>
#include<iomanip>
#include<cmath>

using namespace std;

int maxval(int a,int b,int c){
if(a>b){
if(a>c) return(a);
else return(c);}
else if(b>c) return(b);
else return(c);

}
int minval(int a,int b,int c){
if(a<b){
if(a<c) return(a);
else return(c);}
else if(b<c) return(b);
else return(c);

}
int main()
{
int a,b,c;
cout<<"Enter three integer numbers:";
cin>>a>>b>>c;
cout<<"Max="<<maxval(a,b,c);cout<<"\n";
cout<<"Min="<<minval(a,b,c);
cout<<"\n";
system("PAUSE");
return EXIT_SUCCESS; }

Write a C++ program (using function overloaded) to sort 10 integer values, or 10 long values, or 10 double values.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:14:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>
#include<iomanip>
#include<cmath>

using namespace std;

void mysort(int vallist[]){

int i,j;
int temp;
for(i=0;i<10;i++)
for(j=0;j<10;j++)
if(vallist[j]>vallist[j+1]){
temp=vallist[j];
vallist[j]=vallist[j+1];
vallist[j+1]=temp;
}

for(i=0;i<10;i++)cout<<vallist[i]<<"\n";

}

void mysort(float vallist[]){

int i,j;
float temp;
for(i=0;i<10;i++)
for(j=0;j<10;j++)
if(vallist[j]>vallist[j+1]){
temp=vallist[j];
vallist[j]=vallist[j+1];
vallist[j+1]=temp;
}

for(i=0;i<10;i++)cout<<vallist[i]<<"\n";

}
void mysort(double vallist[]){

int i,j;
double temp;
for(i=0;i<10;i++)
for(j=0;j<10;j++)
if(vallist[j]>vallist[j+1]){
temp=vallist[j];
vallist[j]=vallist[j+1];
vallist[j+1]=temp;
}

for(i=0;i<10;i++)cout<<vallist[i]<<"\n";

}

int main()
{
int vallist[]={23,2,34,23,43,22,32,32,43,34};
mysort(vallist);
system("PAUSE");
return EXIT_SUCCESS; }

Write a C++ basic calculator.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:13:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>
#include<iomanip>

using namespace std;

void displaymenu(){
cout<<"==================================================="<<"\n";
cout<<" MENU "<<"\n";
cout<<"==================================================="<<"\n";
cout<<" 1.Add"<<"\n";
cout<<" 2.Subtract"<<"\n";
cout<<" 3.Multiply"<<"\n";
cout<<" 4.Divide"<<"\n";
cout<<" 5.Modulus"<<"\n";
}
int Add(int a,int b){
return(a+b);
}

int Substract(int a, int b){
return(a-b);
}

int Multiply(int a, int b){
return(a*b);
}
float Divide(int a,int b){
return(a/b);
}
int Modulus(int a, int b){
return(a%b);
}

int main()
{
//show menu
displaymenu();
int yourchoice;
int a;
int b;
char confirm;
do
{
cout<<"Enter your choice(1-5):";
cin>>yourchoice;
cout<<"Enter your two integer numbers:";
cin>>a>>b;
cout<<"\n";
switch(yourchoice){
case 1:cout<<"Sum :"<<Add(a,b);break;
case 2:cout<<"Difference :"<<Substract(a,b);break;
case 3:cout<<"Product :"<<Multiply(a,b);break;
case 4:cout<<"Quotient :"<<Divide(a,b);break;
case 5:cout<<"Remainder :"<<Modulus(a,b);break;
default:cout<<"invalid";
}

cout<<"\nPress y or Y to continue:";
cin>>confirm;
}while(confirm=='y'||confirm=='Y');
system("PAUSE");
return EXIT_SUCCESS;
}

Write a program that will ask the user to input n positive numbers. The program will terminate if one of those number is not positive.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:12:00 +0000

#include <iostream>

using namespace std;
int main(){

int n=0;

for(;;){
cout<<"Enter a positive integer : ";
cin >>n;

if(n<0){
cout<<"You entered a negative number. program exiting ..."<<endl;
break;
}

}

return 0;
}

Write a C++ program that will print the pattern as shown below.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:05:00 +0000

/*

Pattern

*
***
*****
*******
*********
*********
*******
*****
***
*

*/

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>

using namespace std;

int main()
{
int i;
int j;;

for(i=1;i<=9;i=i+2){
for(j=1;j<=i;++j)
cout<<"*";

cout<<"\n";

}
for(i=9;i>=1;i=i-2){
for(j=i;j>=1;--j)
cout<<"*";

cout<<"\n";

}

cout<<"\n";
system("PAUSE");
return EXIT_SUCCESS;
}

Write a program that accepts a number from a user and tells whether the number is even or odd.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 07:03:00 +0000

#include <iostream>
using namespace std;

int main(){

int x =0;

cout<<"Enter an integer number : ";
cin >>x;
cout <<endl;

if(x%2==0){
cout <<x<<" is an even number."<<endl;
}
else{
cout <<x<<" is an odd number."<<endl;
}

return 0;
}

Write a program that determines a student’s grade. The program will read three types of scores (quiz, mid-term, and final scores) and determine the grade based on the below rules.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 06:59:00 +0000

/*

#Rules

-if the average score =90% =>grade=A
-if the average score >= 70% and <90% => grade=B
-if the average score>=50% and <70% =>grade=C
-if the average score<50% =>grade=F

*/

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>
#include<iomanip>

using namespace std;

int main(int argc, char *argv[])
{
float x;
float y;
float z;
float avg;
cout<<"Enter 3 score(quiz, mid-term, and final) vales separated by space:";
cin>>x>>y>>z;
avg=(x+y+z)/3;

if(avg>=90)cout<<"Grade A";
else if((avg>=70) && (avg<90)) cout<<"Grade B";
else if((avg>=50) && (avg<70))cout<<"Grade C";
else if(avg<50) cout<<"Grade F";
else cout<<"Invalid";

cout<<"\n";
system("PAUSE");
return EXIT_SUCCESS;
}

Write a C++ program that prompts the user to input three integer values and find the greatest value of the three values.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 06:57:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>
#include<iomanip>

using namespace std;

int main()
{
int a,b,c,max;

cin>>a>>b>>c;

max=a; //let max take the first value

if(max<b) max=b; // compare max with b and update max

if(max<c) max=c; //compare max with c and take c

cout<<"Max: "<<max; //output max

system("PAUSE");
return EXIT_SUCCESS;
}

Given the following pseudo code, write a program that executes it.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 06:55:00 +0000

/*
Pseudocode

a.read x
b.read y
c.compute p=x*y
d.compute s=x+y
e.total=s2+p*(s-x)*(p+y)
f.Print total
*/

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>
#include<iomanip>

using namespace std;

int main()
{
float x;
float y;
float p;
float s;
float total;
cout<<"Enter x value:";
cin>>x;
cout<<"\n";
cout<<"Enter y value:";
cin>>y;
cout<<"\n";
p=x*y;
s=x+y;
total=s*s+p*(s-x)*(p+y);
cout<<"Total:"<<total;
cout<<"\n";

system("PAUSE");
return EXIT_SUCCESS;
}

Write a C++ program to prompt the user to input 3 integer values and print these values in forward and reversed order.

noreply@blogger.com (Josh) — Sun, 30 Jul 2017 06:52:00 +0000

/*
For more exercises and lessons, visit http://shegertech.blogspot.com/
*/

#include <cstdlib>
#include <iostream>

using namespace std;

int main()
{
int val1;
int val2;
int val3;
cout<<"Please enter your 3 numbers:";
cin>>val1>>val2>>val3;

cout<<"\nYour numbers forward:\n";
cout<<val1<< "\n"<<val2<<"\n" <<val3<<"\n";
cout<< "Your numbers reversed:\n";
cout<<val3<<"\n"<<val2 <<"\n"<<val1<<"\n";

system("PAUSE");
return EXIT_SUCCESS;
}