Program to Swap Numbers Using Temporary Variable
#include <stdio.h>
int main()
{
double firstNumber, secondNumber, temporaryVariable;
printf("Enter first number: ");
scanf("%lf", &firstNumber);
printf("Enter second number: ");
scanf("%lf",&secondNumber);
// Value of firstNumber is assigned to temporaryVariable
temporaryVariable = firstNumber;
// Value of secondNumber is assigned to firstNumber
firstNumber = secondNumber;
// Value of temporaryVariable (which contains the initial value of firstNumber) is assigned to secondNumber
secondNumber = temporaryVariable;
printf("\nAfter swapping, firstNumber = %.2lf\n", firstNumber);
printf("After swapping, secondNumber = %.2lf", secondNumber);
return 0;
}
Output
Enter first number: 1.20
Enter second number: 2.45
After swapping, firstNumber = 2.45
After swapping, secondNumber = 1.20
Program to Swap Number Without Using Temporary Variables
#include <stdio.h>
int main()
{
double firstNumber, secondNumber;
printf("Enter first number: ");
scanf("%lf", &firstNumber);
printf("Enter second number: ");
scanf("%lf",&secondNumber);
// Swapping process
firstNumber = firstNumber - secondNumber;
secondNumber = firstNumber + secondNumber;
firstNumber = secondNumber - firstNumber;
printf("\nAfter swapping, firstNumber = %.2lf\n", firstNumber);
printf("After swapping, secondNumber = %.2lf", secondNumber);
return 0;
}
Output
Enter first number: 10.25
Enter second number: -12.5
After swapping, firstNumber = -12.50
After swapping, secondNumber = 10.25
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