C Program to swap two numbers using Variables .

➤ Swap two numbers using third variable .

#include<stdio.h>
  int main()
{int a,b,temp;
printf("Enter a= ");
scanf ("%d",&a);
printf("Enter b= ");
scanf("%d",&b);
printf("Before Swapping:\n");
printf("a=%d\nb=%d",a,b);
temp=a;
a=b;
b=temp;
printf("\nAfter Swapping:");
printf("\na=%d\nb=%d",a,b);
return 0;
}

➤ OUTPUT :

Enter a= 5

Enter b= 9

Before Swapping:

a=5

b=9

After Swapping:

a=9

b=5

➤ Swap two numbers without using third variable .

#include<stdio.h>
int main()
{int a,b;
printf("Enter the value of a= ");
scanf ("%d",&a);
printf("Enter the value of b= ");
scanf("%d",&b);

printf("Before Swapping:\n");

printf("a=%d\nb=%d",a,b);
a=a+b;
b=a-b;
a=a-b;
printf("\nAfter Swapping:");
printf("\na=%d\nb=%d",a,b);

 return 0;
}

➤ OUTPUT :

Enter value of a= 5

Enter value of b= 3

Before Swapping:

a=5

b=3

After Swapping:

a=3

b=5

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