In this post, we will learn how to find the absolute value of a number using C Programming language.
The absolute value of a number is its distance from 0. For example: the absolute value of 4 is 4 which is its distance from 0, but the absolute value of -4 is also 4.
In this program, we will see how to find the absolute value of an integer, a floating point number and a long integer using a pre-defined abs() function.
So, without further ado, let’s begin this tutorial.
C Program to Find Absolute Value of a Number
// C Program to Find Absolute Value of a Number
#include <stdio.h>
#include <stdlib.h>
int main(){
int num, absolute;
// Asking for input
printf("Enter the number: ");
scanf("%d", &num);
absolute = abs(num);
// Displaying output
printf("Absolute value of %d is %d.", num, absolute);
return 0;
}
Output
Enter the number: -45
Absolute value of -45 is 45.
How Does This Program Work ?
int num, absolute;
In this program, we have declared two int data type variables named num and absolute.
// Asking for input
printf("Enter the number: ");
scanf("%d", &num);
Then, the user is asked to enter a number.
absolute = abs(num);
We find the absolute value of this integer using the abs() function. The abs() function returns the absolute value of an integer. This function is defined under the stdlib.h header file.
// Displaying output
printf("Absolute value of %d is %d.", num, absolute);
Finally, the result is displayed on the screen using printf() function.
C Program to Find Absolute Value of Floating Point Number
// C Program to Find Absolute Value of a Number Using fabs()
#include <stdio.h>
#include <math.h>
int main(){
float num, absolute_num;
// Asking for input
printf("Enter a floating point number: ");
scanf("%f", &num);
absolute_num = fabs(num);
// Displaying output
printf("Absolute value of %.2f is %.2f", num, absolute_num);
return 0;
}
Output
Enter a floating point number: -4484.12
Absolute value of -4484.12 is 4484.12
The fabs() function returns the absolute value of a floating point number. It is defined in the math.h header file.
C Program to Find Absolute Value of long Integer
// C Program to Find Absolute Value of a Number Using labs()
#include <stdio.h>
#include <stdlib.h>
int main(){
long int num, absolute_num;
// Asking for input
printf("Enter a long integer number: ");
scanf("%ld", &num);
absolute_num = labs(num);
// Displaying output
printf("The absolute value of %ld is %ld.", num, absolute_num);
}
Output
Enter a long integer number: -5464545
The absolute value of -5464545 is 5464545.
The labs() function is used to return the absolute value of a long integer number and it is also defined in the stdlib.h header file.
Conclusion
I hope after going through this post, you understand how to find the absolute value of a number using C Programming language.
If you have any doubt regarding the topic, feel free to contact us in the comment section. We will be delighted to guide you.
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