Question

How to implement fmod (floating-point remainder) in C

Answer 1

#include <stdio.h>
#include <math.h>

double get_fmod(double a, double b) { 
    double f_mod = a; 
    
    if (a < 0) 
        f_mod = -a; 

    if (b < 0) 
        b = -b; 
  
    while (f_mod >= b) 
        f_mod = f_mod - b; 
  
    if (a < 0) 
        return -f_mod; 
  
    return f_mod; 
} 
  
int main() 
{ 
    double a = 10.7, b = 3.3; 
    
    printf("%.2f\n", get_fmod(a, b));
    printf("%.2f\n", fmod(a, b)); 
    
    return 0; 
}


/*
run:

0.80
0.80

*/

 

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