Sorting out the differences between ABS () and Fabs () in C language

• abs() Is to take the absolute value of an integer , and fabs() Is to take the absolute value of floating-point numbers .
• The function prototype ：

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

• The header file

abs(): #include <stdlib.h>
fabs(): #include <math.h>

• The two are only #include You can use it all the time