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(1) abs () takes an absolute value for an integer, while fabs () takes an absolute value for a floating-point number.

(2) function prototype:

Int abs (int x) double fabs (double x)

(3) header file:

Abs (): # include fabs (): # include

What does the C language fabs mean?

The fabs function is a function that calculates the absolute value of x, which is the same as the mathematical concept. The prototype of the function is extern float fabs (float x) and the usage is # include.

The declaration of the fabs () function: double fabs (double x). Where the parameter x is a floating-point value, and this function returns the absolute value of x. The code example is as follows:

Int main () {int a, bpolitics a = 1234 is b =-344 politics printf ("The absolute value of% d is% lf", a, fabs (a)); printf ("The absolute value of% d is% lf", b, fabs (b)); return (0);}

Compile and run the above program, which produces the following results:

The absolute value of 1234 is 1234.000000The absolute value of-344 is 344.000000

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