Absolute value in C

Flow Control
If-else Statement in C
Programs on if-else
Switch Case in C
Switch case Programs
Conditional Operator
While loop in C
Do-while loop in C
While vs do-while
For loop in C
Break keyword in C
Continue keyword in C
Break vs Exit in C
Goto keyword in C
☕️ Flow Control Programs
Largest in 3 Numbers
Find Grade of student
Find the absolute value
Vowel or Consonant
Leap Year Program
Simple calculator in C
Check Odd or Even 
Roots of Quadratic Equation
Find Reverse of Number
Factors of a number in C
Generate Multiplication table
Find Power of a Number
Find GCD and LCM
Find factorial of Number
Count Number of Digits
Sum of digits in Number
Sum of N Natural Numbers
Sum of Squares of Natural No.
Find Sum of Odd Numbers
Find the Sum of Series
Find Fibonacci series in C
Sum of the Fibonacci series
Sum until enters +ve numbers
Sum of max 10 no. & Skip -ve
☕️ C Conversion Programs
Celsius to Fahrenheit
Fahrenheit to Celsius
Decimal ↔ Binary
Decimal ↔ Octal
Octal ↔ Binary in C
☕️ Number Programs in C
Prime Number in C
Strong Number in C
Krishnamurthy Number
Neon Number in C
Palindrome number
Perfect Number in C
Armstrong Number
☕️ Pattern Programs in C
Pattern programs in C
Printing pattern using loops
Floyd’s triangle Program
Pascal Triangle Program
Pyramid Star Pattern in C
Diamond Pattern Programs
Half Diamond pattern in C
Print Diamond Pattern
Hollow Diamond Pattern
Diamond Pattern of Numbers

Absolute value describes the distance of a number on the number line from 0 without considering the direction. The absolute value of a number is always positive (distance can never be negative). Here we will develop a program to find the absolute value in C. First, we will develop a program without using any pre-defined function, and later we will develop the C program to find absolute value using the pre-defined abs() function.

Example:- The absolute value of -8 is 8. The absolute value of 5 is 5, and the absolute value of 0 is zero. Similarly, the absolute value of -18.5 is 18.5

abs() function

The abs() function returns the absolute value of an integer. This function is defined under stdlib.h header file.

Function prototype of abs():-
int abs(int x);

  • Required header file:- "stdlib.h"
  • parameter:- int value or int variable
  • Return value:- It returns the absolute value of the given integer number.
#include<stdio.h>
#include<stdlib.h>
int main()
{
  int n;

  printf("Enter a number: ");
  scanf("%d",&n);

  n=abs(n);
  printf("Absolute value = %d\n", n);

  return 0;
}

Output for test1:-

Enter a number: -20
Absolute value = 20

Output for test2:-

Enter a number: 36
Absolute value = 36

labs() function to find absolute value in C

The labs() function is defined in the “stdlib.h” header file, and it is used to find out the absolute value of long integer number in C programming.

Function prototype:-
long int labs(long int x);

Required header file:- "stdlib.h"
Parameter:- long int value or variable
Return value:- Absolute value of the given parameter in long int type

#include<stdio.h>
#include<stdlib.h>
int main()
{
  long int n;

  printf("Enter a long integer number: ");
  scanf("%ld", &n);

  n = abs(n);
  printf("Absolute value = %ld\n", n);

  return 0;
}

Output:-

Enter a long integer number: -545514351
Absolute value = 545514351

fabs() function

It is given in “math.h” header file, and it is used to find out the absolute value of the floating-point number in C programming.

The function prototype is:-
double fabs(double x);

Required header file:- "math.h"
Parameter:- double value or variable
Return value:- Absolute value of the given parameter in double type

#include<stdio.h>
#include<math.h>
int main()
{
  double number;
  double result;

  printf("Enter a number: ");
  scanf("%lf", &number);

  result = fabs(number);
  printf("Absolute value = %lf\n", result);

  return 0;
}

Output:-

Enter a number: -51.508
Absolute value = 51.508000

Absolute value in C without using the predefined function

#include<stdio.h>
int main()
{
  double n;

  printf("Enter a number: ");
  scanf("%f",&n);

  if(n<0.0) n = -n ;

  printf("Absolute value = %f\n", n);

  return 0;
}

Output:-

Enter a number: -52.8
Absolute value = 52.800000

Enter a number: 5
Absolute value = 5.000000

In this C program, we use the if block statement. If the number is negative then convert the number into a positive number otherwise it will remain as it is. To convert the number from negative to positive the minus operator (-) can be used. Finally, the result is displayed to the screen using the printf function.

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Flow Control
If-else Statement in C
Programs on if-else
Switch Case in C
Switch case Programs
Conditional Operator
While loop in C
Do-while loop in C
While vs do-while
For loop in C
Break keyword in C
Continue keyword in C
Break vs Exit in C
Goto keyword in C
☕️ Flow Control Programs
Largest among 3 Numbers
Find Grade of student
Find the absolute value
Check Vowel or Consonant
Leap Year Program
Simple calculator in C
Check Odd or Even 
Roots of Quadratic Equation
Find Reverse of Number
Factors of a number in C
Generate Multiplication table
Find Power of a Number
Find GCD and LCM
Find factorial of Number
Count Number of Digits
Sum of digits in Number
Sum of N Natural Numbers
Sum of Squares of Natural No.
Find Sum of Odd Numbers
Find the Sum of Series
Find Fibonacci series in C
Sum of the Fibonacci series
Sum until enters +ve numbers
Sum of max 10 no. & Skip -ve
☕️ C Conversion Programs
Celsius to Fahrenheit
Fahrenheit to Celsius
Decimal ↔ Binary
Decimal ↔ Octal
Octal ↔ Binary in C
☕️ Number Programs in C
Prime Number in C
Strong Number in C
Krishnamurthy Number
Neon Number in C
Palindrome number
Perfect Number in C
Armstrong Number
☕️ Pattern Programs in C
Pattern programs in C
Printing pattern using loops
Floyd’s triangle Program
Pascal Triangle Program
Pyramid Star Pattern in C
Diamond Pattern Programs
Half Diamond pattern in C
Print Diamond Pattern
Hollow Diamond Pattern
Diamond Pattern of Numbers

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