Modulus of two float or double numbers

Given two floating point numbers, find remainder.

Examples:

Input : a = 36.5,
        b = 5.0
Output : 1.5

Input :  a = 9.7, 
         b = 2.3
Output : 0.5



A simple solution is to do repeated subtraction.

C++

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// CPP program to find modulo of floating 
// point numbers.
#include <bits/stdc++.h>
using namespace std;
  
double findMod(double a, double b)
{
    // Handling negative values
    if (a < 0)
        a = -a;
    if (b < 0)
        b = -b;
  
    // Finding mod by repeated subtraction
    double mod = a;
    while (mod >= b)
        mod = mod - b;
  
    // Sign of result typically depends
    // on sign of a.
    if (a < 0)
        return -mod;
  
    return mod;
}
  
// Driver Function
int main()
{
    double a = 9.7, b = 2.3;
    cout << findMod(a, b);
    return 0;
}

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Java

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// Java program to find modulo of floating 
// point numbers
  
class GFG
{
    static double findMod(double a, double b)
    {
        // Handling negative values
        if (a < 0)
            a = -a;
        if (b < 0)
            b = -b;
      
        // Finding mod by repeated subtraction
        double mod = a;
        while (mod >= b)
            mod = mod - b;
      
        // Sign of result typically depends
        // on sign of a.
        if (a < 0)
            return -mod;
      
        return mod;
    }
      
    // Driver code 
    public static void main (String[] args)
    {
        double a = 9.7, b = 2.3;
        System.out.print(findMod(a, b));
    }
}
  
// This code is contributed by Anant Agarwal.

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Python3

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# Python3 program to find modulo 
# of floating point numbers.
  
def findMod(a, b):
  
    # Handling negative values
    if (a < 0):
        a = -a
    if (b < 0):
        b = -b
  
    # Finding mod by repeated subtraction
    mod = a
    while (mod >= b):
        mod = mod - b
  
    # Sign of result typically 
    # depends on sign of a.
    if (a < 0):
        return -mod
  
    return mod
  
# Driver code
a = 9.7; b = 2.3
print(findMod(a, b))
  
# This code is contributed by Anant Agarwal.

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C#

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// C# program to find modulo of floating 
// point numbers
using System;
  
class GFG {
      
    static double findMod(double a, double b)
    {
          
        // Handling negative values
        if (a < 0)
            a = -a;
        if (b < 0)
            b = -b;
      
        // Finding mod by repeated subtraction
        double mod = a;
        while (mod >= b)
            mod = mod - b;
      
        // Sign of result typically depends
        // on sign of a.
        if (a < 0)
            return -mod;
      
        return mod;
    }
      
    // Driver code 
    public static void Main ()
    {
          
        double a = 9.7, b = 2.3;
          
        Console.WriteLine(findMod(a, b));
    }
}
  
// This code is contributed by vt_m.

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PHP

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<?php
// PHP program to find modulo  
// of floatingpoint numbers.
  
function findMod($a, $b)
{
      
    // Handling negative values
    if ($a < 0)
        $a = -$a;
    if ($b < 0)
        $b = -$b;
  
    // Finding mod by repeated
    // subtraction
    $mod = $a;
    while ($mod >= $b)
        $mod = $mod - $b;
  
    // Sign of result typically 
    // depends on sign of a.
    if ($a < 0)
        return -$mod;
  
    return $mod;
}
  
    // Driver Code
    $a = 9.7; $b = 2.3;
    echo findMod($a, $b);
      
// This code is contributed by anuj_65.
?>

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Output :

0.5

We can use the inbuilt fmod function to find the modulus of two floating-point numbers.

C++

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// CPP program to find modulo of floating 
// point numbers using library function.
#include <bits/stdc++.h>
using namespace std;
  
// Driver Function
int main()
{
    double a = 9.7, b = 2.3;
    cout << fmod(a, b);
    return 0;
}

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PHP

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<?php
// PHP program to find modulo of 
// floating point numbers using
// library function.
  
// Driver Code
$a = 9.7; $b = 2.3;
echo fmod($a, $b);
  
// This code is contributed
// by inder_verma
?>

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Output:

0.5


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Improved By : vt_m, inderDuMCA