In this C++ tutorial, you will learn how to find the absolute value of given argument using abs() function of cmath, with syntax and examples.
C++ abs()
C++ abs(x) returns absolute value of the argument x.
Syntax
The syntax of C++ abs() is
abs(x)
where
| Parameter | Description |
|---|---|
| x | A double, float, long double, or integral type value. |
Returns
The return value depends on the type of value passed for parameter x.
The return value of abs() is
- double if x is double or integral type.
- float if x is float.
- long double if x is long double.
The synopsis of abs() function is
double abs(double x); float abs(float x); long double abs(long double x); double abs(T x); // for integral type argument value
abs() is a function of cmath library. Include cmath library at the start of program, if using abs() function.
Example
In this example, we read a value from user into variable x, and find the absolute value of x using abs() function.
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
double x;
cout << "Enter x : ";
cin >> x;
double result = abs(x);
cout << "abs(" << x << ") : " << result << endl;
} Output
Enter x : -5 abs(-5) : 5 Program ended with exit code: 0
Enter x : -inf abs(-inf) : inf Program ended with exit code: 0
Enter x : 22 abs(22) : 22 Program ended with exit code: 0
Conclusion
In this C++ Tutorial, we learned the syntax of C++ abs(), and how to use this function to find the absolute value of given argument, with the help of examples.