The **`remainder` function** returns the floating-point remainder, which is computed by dividing the numerator with the denominator.

In order to use the `remainder` function, the `cmath` header file needs to be included in the program:

```C++
#include <cmath>
```

Figure 1 below shows how the `remainder` function calculates the remainder. 
The `rquote` is found by dividing the numerator with the denominator and then rounding off to the nearest integer value.


# Parameters
The function takes in two parameters:
1. The value of the numerator
2. The value of the denominator

# Return value

The `remainder` function can have three types of return value:

* float
* double
* long double

These types depend on the type of arguments the programmer gives to the functions.

> If the value of the second argument is zero, the function returns `NaN`.


>  If any argument passed to the `remainder` function is `long double`, then the return type is `long double`. If not, the return type is `double`. If both arguments are of type `float`, the return type is also `float`.

# Example

The code below shows how the `remainder` function functions in C++. Both the arguments are of the same type, which results in the returned value being the same as that of the argument types.

#include <iostream>
#include <cmath>
#include <typeinfo> 
using namespace std;

int main() {
  // both the arguments are of same type.
  double val1 = 7.5;
  double val2 = 2.1;
  cout << "The remainder of " << val1 << "/" << val2 << " is " << remainder(val1,val2) << endl;
  // the type of returned value is output d which means the returned value is of type double.
  cout << "The type of returned value is " << typeid( (remainder(val1,val2))).name() << endl;
  return 0;
}

How to use the remainder() function in C++

Use the `remainder()` function from `<cmath>` to compute floating-point remainders, handling `float`, `double`, and `long double` types.