# fmax() function with example in C++

C++ fmax() function: Here, we are going to learn about the fmax() function with example of cmath header in C++ programming language.
Submitted by IncludeHelp, on April 26, 2019

## C++ fmax() function

fmax() function is a library function of cmath header, it is used to find the maximum value of the given numbers, it accepts two number and returns the larger one.

Syntax of fmax() function:

```    fmax(x, y);
```

Parameter(s): x, y – are the numbers to be used to find the larger value.

Return value: double – it returns double value that is the larger value of x and y.

Example:

```    Input:
float x = 20;
float y = 10;

Function call:
fmax(x,y);

Output:
20
```

### C++ code to demonstrate the example of fmax() function

```// C++ code to demonstrate the example of
// fmax() function
#include <iostream>
#include <cmath>
using namespace std;

// main() section
int main()
{
float x;
float y;
float result;

//input the numbers
cout<<"Enter first number : ";
cin>>x;
cout<<"Enter second number: ";
cin>>y;

//finding the maximum number
result = fmax(x,y);
cout<<"fmax("<<x<<","<<y<<"): "<<result;
cout<<endl;

return 0;
}
```

Output

```First run:
Enter first number : 10
Enter second number: -20
fmax(10,-20): 10

Second run:
Enter first number : 10
Enter second number: 20
fmax(10,20): 20

Third run:
Enter first number : 123.90
Enter second number: 121.88
fmax(123.9,121.88): 123.9

Fourth run:
Enter first number : -123.45
Enter second number: -121.56
fmax(-123.45,-121.56): -121.56
```