C++ Function Definition

A function definition in C++ provides the actual body of the function, including the statements that perform the task. Every function must have a definition to execute its code.

1. Function Definition Syntax

The basic syntax of a function definition is:

return_type function_name(parameter_list) {
    // function body
}

2. Function Definition Example

This example shows a function defined and called in the program.

#include <iostream>
using namespace std;

// Function definition
int multiply(int a, int b) {
    return a * b;
}

int main() {
    int result = multiply(4, 5); // Calling function
    cout << "Result: " << result << endl;
    return 0;
}

3. Common Mistakes

Mismatching the function definition with its declaration or forgetting the function body will cause compilation errors. Always ensure the definition matches the declared signature.

Conclusion

C++ function definitions implement the logic of functions. Proper definitions ensure correct execution, modularity, and reusability of code.