C++

Reference

<cmath> (math.h)

function
<cmath> <ctgmath>

abs

 double abs (double x); float abs (float x);long double abs (long double x);
 double abs (double x); float abs (float x);long double abs (long double x); double abs (T x); // additional overloads for integral types
Compute absolute value
Returns the absolute value of x: |x|.

These convenience abs overloads are exclusive of C++. In C, abs is only declared in <stdlib.h> (and operates on int values).

Since C++11, additional overloads are provided in this header (<cmath>) for the integral types: These overloads effectively cast x to a double before calculations (defined for T being any integral type).

Parameters

x
Value whose absolute value is returned.

Return Value

The absolute value of x.

Example

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// cmath's abs example #include <iostream> // std::cout #include <cmath> // std::abs int main () { std::cout << "abs (3.1416) = " << std::abs (3.1416) << '\n'; std::cout << "abs (-10.6) = " << std::abs (-10.6) << '\n'; return 0; }

Output:
 abs (3.1416) = 3.1416 abs (-10.6) = 10.6


See also

abs (cstdlib)
Absolute value (function)
fabs
Compute absolute value (function)
labs
Absolute value (function)