C++ Functions

User-defined Functions: Functions in C++ are blocks of reusable code used to perform a specific task. They help organize logic and reduce repetition.

1. void sum() - No parameters, no return

#include <iostream>
using namespace std;

void sum() {
  int a = 5, b = 10;
  cout << "Sum = " << a + b << endl;
}

int main() {
  sum();
  return 0;
}

Output: Sum = 15

Explanation: Function prints sum of two numbers. No inputs, no return.

2. void sum(int a, int b) - Parameters, no return

#include <iostream>
using namespace std;

void sum(int a, int b) {
  cout << "Sum = " << a + b << endl;
}

int main() {
  sum(7, 8);
  return 0;
}

Output: Sum = 15

Explanation: Function takes parameters and prints the result.

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