The Engineers Choice

Finding the factorial of given number using Recursion

2021-05-25T08:49:00.004+05:45

let us now see a simple example of recursion. Suppose we want to calculate the factorial value of an integer. As we know, the factorial of a number is the product of all the integers between 1 and that number.

For example, 4 factorial is 4*3*2*1. This can also be expressed as 4!=4*! where '!' stands for factorial. Thus factorial of a number can be expressed in the form of itself. Hence, before we try to write a recursive function for calculating factorial let us take a look at the non-recursive function for calculating the factorial value of an integer.

Program

#include<stdio.h>

#include<conio.h>

nt factorial(int )

int main( )

{

int a, fact;

printf("enter any number");

scanf("%d",&a);

fact=factorial(a);

printf("factorialValue=%d\n",fact);

return 0;

}

int factorial(int x)

{

int f=1,i;

for (i=x;i>=1;i--)

f=f*i;

return (f);

}

And here is the output...

enter any number 3

factorial value= 6

Calculation of gross salary .

2021-05-24T11:23:00.001+05:45

#include<stdio.h>

#include<conio.h>

int main()

{

float bs, gs, da, hra;

printf("Enter the basic salary");

scanf("%f",&bs);

if(bs<1500)

{

hra=bs*10/100;

ds=bs*90/100;

}

else

{

hra=500;

da=bs*98/100;

}

gs=bs + hra + da;

printf("Gross salary =Rs%f|\n",gs);

return 0;

}

Calculate the total expense of your money.

2021-05-23T13:51:00.002+05:45

#include <conio.h>

#include<stdio.h>

int main()

{

int qty, dis;

float rate, tot;

printf("Enter quantity and rate");

scanf("%d %f", &qty, &rate");

if(qty>1000)

dis=10;

else

dis=0;

tot=(qty*rate) - (qty * rate * dis / 100);

printf("total expenses=Rs. %f \n",tot);

return 0;

}

Receving Inputs From Users

2021-05-22T11:11:00.000+05:45

/* Calculation of simple Interest */

#include<stdio.h>

#include<conio.h>

int main( )

{

int p,n;

float r,si;

printf("Enter values of p,n,r,");

scanf("%d%d%f ", &p,&n,&r);

si= p*n*r/100;

printf("%f\n",si);

return 0;

}

WAP in C to print message in Function

2021-05-22T08:28:00.002+05:45

#include<stdio.h>

#include<conio.h>

void message( ); /*funtion prototype declaration */

int main( )

{

message( ); /*function call*/

printf("hello world\n");

return 0;

}

void message( ) /*funtion defination */

{

prntf("smile,and the world smile with you ");

}

C++ program to calculate the area of hexagon

2020-11-30T09:04:00.004+05:45

#include<iostream.h>

#include<conio.h>

#include<math.h>

int main()

{

int a;

float A;

cout<<"enter the side:";

cin>>a;

A=3*(pow(3,0.5)/2)*a*a;

cout<<"Area is:"<<A;

getch();

return 0;

}

To Run:

Output:

C++ program to calculate the diagonal of cube

2020-11-30T08:51:00.004+05:45

#include<iostream.h>

#include<conio.h>

#include<math.h>

int main()

{

int a;

float r;

cout<<"enter the a:";

cin>>a;

r=pow(3,0.5)*a;

cout<<"Diagonal is:"<<r;

getch();

return 0;

}

To Run:

Output:

Calculate the area of circle in C++.

2020-11-30T08:22:00.005+05:45

#include<iostream.h>

#include<conio.h>

int main( )

{

int r;

float a;

cout<<"enter the Radius:";

cin>>r;

a=3.14159*r*r;

cout<<"Area is:"<<a;

getch( );

return 0;

}

To Run:

Output:

Calculate the area of Ellipse in C++.

2020-11-30T08:12:00.004+05:45

#include<iostream.h>

#include<conio.h>

int main( )

{

int a,b;

float r;

cout<<"enter Axis a:";

cin>>a;

cout<<"enter Axis b:";

cin>>b;

r=3.14159*a*b;

cout<<"Ellipse area is="<<r;

getch( );

return 0;

}

To Run:

Output:

C++ program to calculate the base area of cylinder

2020-11-30T07:57:00.001+05:45

#include<iostream.h>

#include<conio.h>

int main( )

{

int r;

float a;

cout<<"enter the Radius:";

cin>>r;

a=3.14159*r*r;

cout<<"Base area is:"<<a;

getch( );

return 0;

}

To Run:

Output:

Calculate Percentage in C++.

2020-11-28T20:22:00.001+05:45

#include<iostream.h>

#include<conio.h>

int main( )

{

clrscr( );

int v,p,result;

cout<<"Enter the value...";

cin>>v;

cout<<"Enter the persentage...";

cin>>p;

result=v*p/100;

cout<<"\nAverage Marks = "<<result;

cout<<endl;

getch( );

return 0;

}

To run:

output:

Today cold or hot program in C++.

2020-11-26T09:42:00.005+05:45

#include<iostream.h>

#include<conio.h>

int main()

{

clrscr();

int temp;

cout << "Enter tempreture; " << endl;

cin >> temp;

if (temp >= 30)

{

cout << "Today is Hot: " << endl;

}

else

{

cout << "Today is Cold; " << endl;

}

getch();

return 0;

}

To run:

output:

Constructor Overloading in C++

2020-11-08T18:45:00.002+05:45

#include<iostream.h>

#include<conio.h>

class cat

{

private:

int a,b,c;

public:

cat (int k,int v)

{

a=k;

b=v;

cout<<a<<b;

}

cat(cat&y)

{

a=y.a;

b=y.b;

cout<<a<<b;

}

cat()

{

cout<<"cat";

}

};

int main()

{

cat obj,obj3(35,6),obj4(obj3);

getch();

return 0;

}

To Run:

Output:

How To Speed Up Your PC Without Any Software

2020-10-27T13:56:00.006+05:45

Slow performance is a common problem of any pc, you're not the only one who faces this problem. when you buy a pc it works well but after 5-6 months you start facing slow performances, lags etc.

To avoid these problems or to make your pc faster as newly buyed pc follow these steps:

Step 1: Press Win+R and type temp and then hit enter key.

Step 2: Select all and delete (with Shift+Delete) and click Yes

Step 3: Press Win+R and type %temp% and then hit enter key.

Step 4: Select all and delete (with Shift+Delete) and click Yes

Step 5: Press Win+R and type recent and then hit enter key.

Step 6: Select all and delete (with Shift+Delete) and click Yes

Step 7: Press Win+R and type prefetch and then hit enter key.

Step 8: Select all and delete (with Shift+Delete) and click Yes

How to check password of connected WiFi

2020-10-26T13:20:00.005+05:45

To see WiFi password in your pc using control panel follow these steps:

Step 1: click on windows icon and type/search view network connections and then hit enter

Step 2: Double click on WiFi

Step 3: Click on Wireless Properties

Step 4: Click on Security.

Step 4: Click on ▢show characters, as you can see it's showing the password(12345678)

Simple Destructor Program in C++

2020-10-25T18:25:00.033+05:45

#include<iostream.h>

#include<conio.h>

class cat

{

private:

int age,count;

public:

cat()

{

count ++;

cout<<"age is:"<<count;

}

~cat()

{

cout<<"object is destroyed"<<count;

count --;

}

};

int main()

{

clrscr();

cout<<"main block";

cat obj1;

{

cout<<"block";

cat obj2,ob3;

}

getch();

return 0;

}

To run:

Output:

How To Update Windows

2020-10-25T12:16:00.003+05:45

Windows Update is used to keep Microsoft Windows and several other Microsoft programs updated. Updates often include feature enhancements and security updates to protect Windows from malware and malicious attacks.

To update your windows follow these steps:-

Step 1: Click on windows icon and search UPDATES and then hit enter

Step 2: click on DOWNLOAD

Step 3: After that wait for a while to download the update

Step 4: After download completes, restart your pc

How To Delete Guest Account

2020-10-24T07:26:00.003+05:45

Disabling Guest Accounts on Windows is Important for Security. Guest user accounts are undesirable because they grant anonymous access to local data and applications (IT Pro Today). This puts a lot of pressure on IT admins to ensure that permissions are set properly on file servers and network file shares

To disable guest account, follow these steps.

Step 1: click on windows icon and press add, edit or remove other users and hit enter.

Step 2: Click on the guest’s account name and click remove. For example: here my guest’s account name is FOR BROTHER so, I will click on FOR BROTHER and then I will click on remove

Step 3: There will be a dialog box on your screen, click on Delete account and data.

Step 4: It will take a bit of your time (around 30-40 secs) wait until it and then you can see there is no guest account.

How to add another user (Guest user) to your pc

2020-10-23T07:45:00.010+05:45

Guest Users are users who can only access files and folders shared with them. Guest users do not have their own home storage. Hence, guest users cannot create their own folders or upload files directly to the root of the account. ... For example:- a tenant with 3 paid user licenses can create 9 guest user accounts.

To add guest user, follow the following steps.

Step 1: Click on windows icon and search other users and hit enter.

Step 2: Click on add someone else to this pc

Step 3: Then enter your Microsoft account and if you don’t have one click, I don’t have this person’s sign in information.

Step 4: Then click add a user without a Microsoft account.

Step 5: Select a username and type a password but if you don’t want to secure the account leave the boxes empty as I have done ‘cuz I don’t need to secure it, and then click next .

Step 6: As you can see there’s another user named as FOR BROTHER it means the guest account has been created successfully.

Note: To check whether the guest account is working or not go to desktop and press Alt+f4 and choose switch user.

Copy Constructor in C++

2020-10-21T14:51:00.002+05:45

#include<iostream.h>

#include<conio.h>

class cat

{

private:

int a,b,c;

public:

cat (int k,int v)

{

a=k;

b=v;

cout<<a<<b;

}

cat(cat&y)

{

a=y.a;

b=y.b;

cout<<a<<b;

}

cat()

{

cout<<"cat";

}

};

int main()

{

cat obj,obj3(35,6),obj4(obj3);

getch();

return 0;

}

To Run :

Output :

Simple Constructor Program in C++

2020-10-17T12:45:00.001+05:45

#include<iostream.h>

#include<conio.h>

class car

{

public:

car( )

{

cout<<"hello student";

}

};

int main()

{

car a;

getch();

return 0;

}

To run :

Output:

How To Set Hard Drive Password in Windows 10

2020-10-16T16:01:00.039+05:45

Before Set Hard Drive Password, we need to understand why we should use Bitlocker.

Bit locker encrypts disk drives and their contents. When encrypted, others cannot see your files even if the computer had been stolen or the hard disk was taken.

The primary reason to use BitLocker on the computers is to minimize the chance that useful data can be recovered from lost storage devices by a third party.

To Set Hard Drive Password , follow these following steps:

1. Open this pc.

2. Right click on the drive in which you want to activate bit locker.

3. Then click on “Turn bitlocker on”.

4. Then this dialog box will appear, after appearing the dialog box click on “use a password to unlock the drive”.

5. Then enter a strong password in both two boxes, and click “Next”.

6. Then this dialog box is appear, after appearing the dialog box click on “save to a file”.

7. Then Select a secure destination to save your recovery key. After choosing a destination click on “save”.

8 . After saving the recovery key, click “Next”.

9. Then this type of dialog box is appear, after appearing the dialog box click on “Encrypt entire drive (slower but best for PCs and drives already in use)” and then click “Next”.

10. Then this type of dialog box is gonna appear, after appearing the dialog box click on “New encryption mode (best for fixed drives on this device)” and then click “Next”.

11. Then this type of dialog box will appear, after appearing the dialog box click on “Start encrypting”..

12. Then your encryption will start as shown below..

It will take 3-5 min.

13. After encrypting completes restart your pc/computer.

14. And after restarting you can see the drive is locked.And you can unlock with the password which you have given.....

Note1: - when you set your password it must include alphabets and numbers both

Note 2:- Remember to save your recovery key in a safe location because if someone finds your recovery key he/she can unlock your drive using the recovery key.

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Find Area of rectangle in C++.

2020-10-12T15:23:00.004+05:45

#include<iostream.h>

#include<cconio.h>

int main( )

{

int height;

float area, breath;

court<<"Enter the height";

cin>>height;

cout<<"Enter the breath";

cin.>>breath;

area=(0.5)*height*breath;

cout<<"area of triangle is"<<area;

getch( );

return 0;

}

To run:

Output:

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Function call in C++.

2020-10-08T17:40:00.003+05:45

#include<iostream.h>

#include<conio.h>

class add

{

int a, b, sum;

public:

void get( )

{

cout<<"Enter the number for a";

cin>>a;

cout<<"Enter the number for b";

cin>>b;

sum=a+b;

cout<<"sum is:"<<sum;

}

};

int main( )

{

add obj;

obj.get( );

getch( );

return 0;

}

To run:

Output:

Greatest Among three number in Java with Flowchart || Advanced Java Program

2020-10-04T08:05:00.003+05:45

Flowchart:-

Program:-

import java.util.Scanner;

public class first

{

public static void main(String[] args)

{

int a, b, c;

Scanner obj = new Scanner(System.in);

System.out.print("Enter three numbers: ");

a = obj.nextInt();

b =obj.nextInt();

c = obj.nextInt();

if((a > b) && (a > c))

System.out.print(" Greater number among "+a+","+b+","+c+" is "+a);

else if((b > a) && (b > c))

System.out.print("Greater number among "+a+","+b+","+c+" is "+b);

else if ((c > a) && (c > b))

System.out.print("Greater number among "+a+","+b+","+c+" is "+c);

else

System.out.println("Not applicable");

}

Output:-

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