C Program to Find the Absolute Value of a Number

Write a C program to find the absolute value of a number, a positive integer of a given number. In C programming, the stdlib header has an abs function that prints the absolute value.

#include <stdio.h>
#include <stdlib.h>

int main()
{   
    int num;
    
    printf("Enter Number to find Absolute Value = ");
    scanf("%d",&num);

    int abNum = abs(num);

    printf("\nActual Number   = %d", num); 
    printf("\nAbsolute Number = %d\n", abNum);
}

In C language math header file has a fabs function that accepts the double and floating point numbers and finds the absolute value. In this c program, we use fabs to find the absolute value of floating-point numbers.

#include <stdio.h>
#include <math.h>

int main()
{   
    double num;
    float num2;
    
    printf("Enter Double Number = ");
    scanf("%lf",&num);

    printf("Enter Float Number  = ");
    scanf("%f",&num2);

    double abNum = fabs(num);

    printf("\nActual Double Number   = %lf", num); 
    printf("\nAbsolute Double Number = %lf\n", abNum);

    float abNum2 = fabs(num2);

    printf("\nActual Float Number   = %.3f", num2); 
    printf("\nAbsolute Float Number = %.3f\n", abNum2);
}

Enter Double Number = -34556.8765
Enter Float Number  = -2345.239f    

Actual Double Number   = -34556.876500
Absolute Double Number = 34556.876500

Actual Float Number   = -2345.239
Absolute Float Number = 2345.239

This c example uses the labs function to find the absolute value of a long number.

#include <stdio.h>
#include <stdlib.h>

int main()
{   
    long num;
    
    printf("Enter Number = ");
    scanf("%ld",&num);

    long abNum = labs(num);

    printf("\nActual   = %ld", num); 
    printf("\nAbsolute Number = %ld\n", abNum);
}

Enter Number = -654323456

Actual   = -654323456
Absolute Number = 654323456

It is a simple code to find the absolute value of any number in c using an if statement that checks whether the number less than zero. If true, assign a positive number.

#include <stdio.h>

int main()
{   
    int num;
    
    printf("Enter Number = ");
    scanf("%d",&num);

    if(num < 0)
    {
        num = -num;
    }
    printf("\nAbsolute Number = %d\n", num);
}

Enter Number = -99

Absolute Number = 99