Difference of two integer numbers program

/*C program to find difference of two numbers.*/
 
#include <stdio.h>
 
int main()
{
     
    int a,b;
    int diff;
 
    printf("Enter first number: ");
    scanf("%d",&a);
    printf("Enter second number: ");
    scanf("%d",&b);
 
    // check condition to identify which is largest number
    if( a>b )
        diff=a-b;
    else
        diff=b-a;
 
    printf("\nDifference between %d and %d is = %d",a,b,diff);
    return 0;
}

Output

First Run:
Enter first number: 120
Enter second number: 30

Difference between 120 and 30 is = 90

Second Run:
Enter first number: 30
Enter second number: 120

Difference between 30 and 120 is = 90

Using abs() – A Shortest way to find difference of two numbers

By using abs() function we can get the difference of two integer numbers without comparing them, abs() is a library function which is declared in stdlib.h – This function returns the absolute value of given integer.

Consider the example

/*C program to find difference of two numbers using abs().*/
 
#include <stdio.h>
#include <stdlib.h>
 
int main()
{
     
    int a,b;
    int diff;
 
    printf("Enter first number: ");
    scanf("%d",&a);
    printf("Enter second number: ");
    scanf("%d",&b);
 
    diff=abs(a-b);
 
    printf("\nDifference between %d and %d is = %d",a,b,diff);
    return 0;
}

Output

First Run:
Enter first number: 120
Enter second number: 30

Difference between 120 and 30 is = 90

Second Run:
Enter first number: 30
Enter second number: 120

Difference between 30 and 120 is = 90