C++ program to find last prime number that occurs before enter number

#include<iostream>
int main()
{
 int num,count=0;
 cout<<"Enter number to find last prime number occurs before it: ";
 cin>>num;
  for( int a=num-1;a>=1;a--)
  {
   for(int b=2;b<a;b++)
      {
       if(a%b==0)
       count++;
       }
       if(count==0)
       {
      if(a==1)
       {
       cout<<"no prime number less than 2";
       break;
     }
      cout<<a<<" is the last prime number before entered number";
       break;
       }
       count=0;
}
return 0;
}

C++ code to swap two variables without using third variable

#include<iostream>


int main()

{

int var1, var2;

 cout<<"Enter value for first integer:  ";

 cin>>var1;

 cout<<"Enter value for second integer:  ";

 cin>>var2;

 cout<<" Values Before swapping:  "<<endl;

 cout<<"First Integer ="<<var1<<endl;

 cout<<"Second Interger ="<<var2<<endl;

              var1=var1+var2;

              var2=var1-var2;

              var1=var1-var2;

 cout<<" Values After swapping:  "<<endl;

 cout<<"First Integer ="<<var1<<endl;

 cout<<"Second Interger ="<<var2<<endl;

    return 0;

}

C++ program code to swap the values of two integer:

#include<iostream>

using namespace std;

int main()

{

int var1, var2, swap;

 cout<<"Enter value for first integer:  ";

 cin>>var1;

 cout<<"Enter value for second integer:  ";

 cin>>var2;

 cout<<" Values Before swapping:  "<<endl;

 cout<<"First Integer ="<<var1<<endl;

 cout<<"Second Interger ="<<var2<<endl;

              swap=var1;

              var1=var2;

              var2=swap;

 cout<<" Values After swapping:  "<<endl;

 cout<<"First Integer ="<<var1<<endl;

 cout<<"Second Interger ="<<var2<<endl;

 return 0;

}

C++ program to find the Area and Perimeter of a Rectangle:

C++ program to find the Area and Perimeter of a Rectangle:


#include<iostream>


int main()

{

    int width,height,area,perimeter;

    cout<<"Enter  Width of Rectangle = ";

    cin>>width;

    cout<<"Enter  Height of Rectangle = ";

    cin>>height;

    area=height*width;

    cout<<"Area of Rectangle ="<<area<<endl;

    perimeter=2*(height+width);

cout<<" Perimeter of rectangle are = "<<perimeter<<endl;

return 0;

}

C++ Program to find the area of any triangle using Heron's Formula

#include<iostream>

#include<math.h>

using namespace std;

int main()

{

    float first,second,third;

    float s,area;

    cout<<"Enter size of each sides of triangle"<<endl;

    cout<<"Enter size for First Side =";

    cin>>first;

    cout<<"Enter size for Second Side =";

    cin>>second;

    cout<<"Enter size for Third Side =";

    cin>>third;

    s = (first+second+third)/2;

    area = sqrt(s*(s-first)*(s-second)*(s-third));

    cout<<"Area of Triangle= "<<area<<endl;

    return 0;

}

C++ Program to Find the Binary Value of Decimal Number Using for loop

#include<iostream.h>
#include <stdio.h>
int main()
{
  int n,x,a, c, k;

  cout<<"Enter an integer in decimal number system";
  cin>>x;
  n=x;
  cout<<"Binary Value OF Given Number Is: ";

 for( a=1;n!=0;a++)

  {
     n=n/2;

  }

a=a-2;
  for (c = a; c >= 0; c--)
  {
    k = x >> c;

    if (k & 1)
      cout<<"1";
    else
      cout<<"0";
  }
 return 0;
}

Program to find factorial of Number in C++

#include<iostream>
int main()
{

    int num,factorial=1;

    cout<<" Enter Number To Find Its Factorial:  ";

    cin>>num;

    for(int a=1;a<=num;a++)

    {

        factorial=factorial*a;

    }

cout<<"Factorial of Given Number is ="<<factorial<<endl;

    return 0;
}