What is the difference between abs() and fabs() functions?

Question

What is the difference between abs() and fabs() functions in C programming language.

Answer 1

Prototype: int abs(int n);
Computes the absolute value of an integer number `n`.

Prototype: double fabs(double n);
Computes the absolute value of a floating point number `n`.

fabs has defined in <math.h>
abs has defined in <stdlib.h>
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https://en.cppreference.com/w/c/numeric/math/abs
https://en.cppreference.com/w/c/numeric/math/fabs