C PROGRAM TO SWAP TWO NUMBERS.

C Program to swap two numbers.

(Entered by User)

#include<stdio.h>
int main() {
      double n1, n2, temp;
      printf("Enter First Number: ");
      scanf("%lf", &n1);
      printf("Enter Second Number: ");
      scanf("%lf", &n2);

      // Value of first is assigned to temp
      temp = n1;

      // Value of second is assigned to first
      n1 = n2;

      // Value of temp (initial value of first) is assigned to second
      n2 = temp;

      printf("\nAfter swapping, First Number = %.2lf\n", n1);
      printf("After swapping, Second Number = %.2lf", n2);
      return 0;
}

Output

Enter First Number: 23.77
Enter Second Number: 1.02

After swapping, First Number = 1.02
After swapping, Second Number = 23.77

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Explanation 

• In above example temp variable is assigned to n1 variable.
• Then the value of n1 variable is assigned to n2 variable.
• At last, the temp (holding value of n1) is assigned to n2 variable. 
• This completes the swapping process. 

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