
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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---
### Understanding Function Overloading in C++
**Objective:** Determine the output of the following program.
```cpp
#include <iostream>
using namespace std;
void cdabs(int);
void cdabs(float);
void cdabs(double);
int main() {
cdabs(3);
cin.ignore();
return 0;
}
void cdabs(int x) {
cout << x << " is an int" << endl;
}
void cdabs(float x) {
cout << x << " is a float" << endl;
}
void cdabs(double x) {
cout << x << " is a double" << endl;
}
```
**Explanation:**
This C++ program demonstrates function overloading—a feature that allows multiple functions with the same name but with different parameter types.
- **Function Declarations:**
- `void cdabs(int);` - Declares a function that takes an integer parameter.
- `void cdabs(float);` - Declares a function that takes a float parameter.
- `void cdabs(double);` - Declares a function that takes a double parameter.
- **Main Function:**
- Calls the `cdabs` function with the integer argument `3`.
- **Function Definitions:**
- `cdabs(int x)` is called because the argument `3` is an integer. This function outputs: `3 is an int`.
- **Output:**
- The program output will be:
```
3 is an int
```
This illustrates how C++ selects the appropriate function to execute based on the parameter type during a function call. In this case, `cdabs(int x)` is chosen due to the integer argument.
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