C programming, Swap two numbers using temporary variable.

#include<stdio.h>

int main() {

  double first, second, temp;

  printf("Enter first number: ");

  scanf("%lf", &first);

  printf("Enter second number: ");

  scanf("%lf", &second);

  temp = first;

  first = second;

  second = temp;

  printf("\nAfter swapping, first number = %.2lf\n", first);

  printf("After swapping, second number = %.2lf", second);

  return 0;

}