C: Functions

A core feature that allows you to bundle code into reusable units for better management.

1. Function Definition and Invocation

#include <stdio.h>

// Function definition
int add(int a, int b) {
    return a + b;
}

int main() {
    int sum = add(10, 20); // Function call
    printf("Total sum: %d\n", sum);
    return 0;
}

2. Parameters and Return Values

• Parameter: Input values passed into the function.
• Return Value: The result the function sends back after execution.
• void type: Used when a function does not return a value (e.g., void printHello()).

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tip

When writing large programs, breaking down features into smaller functions makes debugging and maintenance much easier.