C++ fmod()

The fmod() function in C++ computes the floating point remainder of numerator/denominator (rounded towards zero).

`fmod (x, y) = x - tquote * y`

where tquote is truncated i.e. (rounded towards zero) result of x/y.

fmod() prototype [As of C++ 11 standard]

```double fmod(double x, double y);
float fmod(float x, float y);
long double fmod(long double x, long double y);
double fmod(Type1 x, Type2 y); // Additional overloads for other combinations of arithmetic types
```

The fmod() function takes a two arguments and returns a value of type double, float or long double type. This function is defined in <cmath> header file.

fmod() Parameters

• x: The value of numerator.
• y: The value of denominator.

fmod() Return value

The fmod() function returns the floating point remainder of x/y. If the denominator y is zero, fmod() returns NaN (Not a Number).

Example 1: How fmod() works in C++?

``````#include <iostream>
#include <cmath>

using namespace std;

int main()
{
double x = 7.5, y = 2.1;
double result = fmod(x, y);
cout << "Remainder of " << x << "/" << y << " = " << result << endl;

x = -17.50, y = 2.0;
result = fmod(x, y);
cout << "Remainder of " << x << "/" << y << " = " << result << endl;

return 0;
}``````

When you run the program, the output will be:

```Remainder of 7.5/2.1 = 1.2
Remainder of -17.5/2 = -1.5```

Example 2: fmod() function for arguments of different types

``````#include <iostream>
#include <cmath>

using namespace std;

int main()
{
double x = 12.19, result;
int y = -3;

result = fmod(x, y);
cout << "Remainder of " << x << "/" << y << " = " << result << endl;

y = 0;
result = fmod(x, y);
cout << "Remainder of " << x << "/" << y << " = " << result << endl;

return 0;
}
``````

When you run the program, the output will be:

```Remainder of 12.19/-3 = 0.19
Remainder of 12.19/0 = -nan
```