abs

Remonter à Math.h - Index

Header File

stdlib.h, math.h

Category

Math Routines, Inline Routines

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

1. 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.

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;
 }

Portability

POSIX	Win32	ANSI C	ANSI C++
+	+	+	+