C++ fuuction pro & swap Pro

++ program to swap two variables without using third variable or temporary variable

#include
#include
using namespace std;
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:  "<  cout<<"First Integer ="<  cout<<"Second interger ="<               var1=var1+var2;
              var2=var1-var2;
              var1=var1-var2;
 cout<<" Values after swapping:  "<  cout<<"First integer ="<  cout<<"Second interger ="<     return 0;
}

C++ program to find the last prime number before number entered

#include

#include
using namespace std;
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       {
       if(a%b==0)
       count++;
       }
       if(count==0)
       {
      if(a==1)
       {
       cout<<"no prime number less than 2";
       break;
     }
      cout<        break;
       }
       count=0;
}
return 0;
}

C++ program to find fibonacci series with simple logic

#include

#include

using namespace std;

int main()

{

int range, first = 0, second = 1, fibonicci=0;

cout << "Enter Range for Terms of Fibonacci Sequence: ";

cin >> range;

cout << "Fibonicci Series upto " << range << " Terms "<< endl;

for ( int c = 0 ; c < range ; c++ )

{

if ( c <= 1 )

fibonicci = c;

else

{

fibonicci = first + second;

first = second;

second = fibonicci;

}

cout << fibonicci <<" ";

}

return 0;

}

C++ program to swap two numbers using built in swap function in c++ standard library

#include

#include

using namespace std;

void swap()

{

    cout<<"this is my swap";

}

int main()

{

    int firstNum , secondNum;

    cout<<"Enter value for First Number:   ";

    cin>>firstNum;

    cout<<"Enter value for Second Number:  ";

    cin>>secondNum;

    cout<<"\n\n";

    cout<<"Values before calling built in swap function"<

    cout<<"\tFirst  Number = "<

    cout<<"\tSecond Number = "<

     cout<<"\n\n";

     std::swap( firstNum , secondNum );

    cout<<"Values After Calling Bulit in  Swap Function"<

    cout<<"\tFirst Number = "<

    cout<<"\tSecond Number = "<

    return 0;

}