C Program to Interchange Numbers

In this tutorial you will learn about the C Program to Interchange Numbers and its application with practical example.

In this tutorial, we will learn to create a C program that will Interchange Numbers in C programming.

Table Of Contents−

C Program to Interchange Numbers

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

Operators in C Programming.

Basic Input and Output function in C Programming.
Basic C programming.
While loop in C programming.

Program to Interchange Numbers:-

As we all know the c is a very powerful language. With the help of c programming language, we can make many programs. We can perform many input-output operations using c programming. In today’s tutorial, we take the input numbers from the user. Then we will Interchange Numbers with the help of the c programming language.

With the help of this program, we can Interchange Numbers.

Algorithm:-

1. Declare the variables for the program. 

2. Taking the input numbers from the user. 

3. Swapping that number using third variable.  

4. Print the Result. 

5. End the program.

1. Declare the variables for the program.

2. Taking the input numbers from the user.

3. Swapping that number using third variable.

4. Print the Result.

5. End the program.

Program to Interchange Numbers using a third variable:-

#include<stdio.h>
int main() 
{
  /* Declaring the variable for the program */
  double first, second, flag;
  
  /* Taing input integer 1 from the user */
  printf("Enter first number: ");
  scanf("%lf", &first);
  
  /* Taing input integer 2 from the user */
  printf("Enter second number: ");
  scanf("%lf", &second);

  // value of first is assigned to flag
  flag = first;

  // value of second is assigned to first
  first = second;

  // value of flag (initial value of first) is assigned to second
  second = flag;

  // %.2lf displays number up to 2 decimal points
  printf("\nAfter swapping, first number = %.2lf\n", first);
  printf("After swapping, second number = %.2lf", second);
  return 0;
}

#include<stdio.h>

int main()

{

/* Declaring the variable for the program */

double first, second, flag;

/* Taing input integer 1 from the user */

printf("Enter first number: ");

scanf("%lf", &first);

/* Taing input integer 2 from the user */

printf("Enter second number: ");

scanf("%lf", &second);

// value of first is assigned to flag

flag = first;

// value of second is assigned to first

first = second;

// value of flag (initial value of first) is assigned to second

second = flag;

// %.2lf displays number up to 2 decimal points

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

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

return 0;

}

Output:-

In the above program, we have first initialized the required variable.

first= it will hold the double value.

second = it will hold the double value.
flag = it will hold the double value.

Taking the input number 1.

Taking the input number 2.

Swapping the numbers.

Printing the output numbers.

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C Program to Interchange Numbers