you can use math.h es as it defines several math functions and a macro.

All functions available in this library take double as an argument and return double as a result.

For example:

double fabs(double x) – The C library function double fabs(double x) returns the absolute value of x.

 syntax : double fabs(double x)

 // C code to illustrate // the use of fabs function #include <stdio.h> #include <math.h> int main () { int a, b; a = 1234; b = -344; printf("The absolute value of %d is %lf\n", a, fabs(a)); printf("The absolute value of %d is %lf\n", b, fabs(b)); return(0); }

Output:

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