# Difference between fabs and abs function in C++

In this tutorial, let’s study the difference between fabs and abs function in C++.

Fabs() and abs() functions are almost identical and are included in <cmath> header file in C++ language.

The difference between the fabs() and abs() function is that fabs() function is used for floating values and abs() function is used for integer values.

## abs() function

abs() function returns the absolute value for the integer.

### Example 1

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

int main() {
cout << fabs(-64) << "\n";

return 0;
}```

```64
```

### Example 2

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

int main() {
int num = -34;
cout << abs(num) << "\n";

return 0;
}
```

```34
```

## fabs() function

fabs() function returns the absolute value of the floating number.

### Example 1

```#include <iostream>
#include <cmath>
using namespace std;
​
int main() {
cout << fabs(-64.89) << "\n";

return 0;
}
​
```

`64.89`

### Example 2

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

int main() {
float num = -34.98;
cout << abs(num) << "\n";

return 0;
}

```

#### Output

`34.89`

Note:

We can also use the abs() and fabs() function for other data types such as double, long including int, and float.