abs

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Header file

stdlib.h, math.h

Prototype

int abs(int x);

Description

Returns the absolute value of an integer.

abs returns the absolute value of the integer argument x. If abs is called when stdlib.h has been included, it's treated as a macro that expands to inline code.

If you want to use the abs function instead of the macro, include

#undef abs

in your program, after the #include <stdlib.h>.

Return Value

The abs function returns an integer in the range of 0 to INT_MAX, with the exception that an argument with the value INT_MIN is returned as INT_MIN. The values for INT_MAX and INT_MIN are defined in header file limit.h.

Portability

	POSIX	ANSI C	ANSI C++	NT+	Win32	Win64	OS X
abs	+	+	+	+	+

Example

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

int main(void) {
	int number = -1234;
	printf("number: %d  absolute value: %d\n", number, abs(number));
	return 0;
}

See also

• labs
• cpp.stdlib.labs is more meaningful