Functions in c

Functions in C - Interactive Learning

A function is a block of code that performs a specific task. Functions help in code reusability and better structure.

Syntax:

return_type function_name(parameters);

Example:

int add(int a, int b);

Syntax:

return_type function_name(parameters) {

    // body of the function

    return value;

}

    

Example:

int add(int a, int b) {

    return a + b;

}

    

Syntax:

function_name(arguments);

Example:

#include <stdio.h>

int add(int, int);

int main() {

    int result = add(5, 10);

    printf("Sum = %d", result);

    return 0;

}

    

These are pre-defined functions in header files.

Examples:

#include <stdio.h>

#include <math.h>

int main() {

    printf("Square root: %f", sqrt(16));

    printf("\nPower: %f", pow(2, 3));

    return 0;

}

    

These are functions created by the programmer.

Example:

#include <stdio.h>

int multiply(int x, int y) {

    return x * y;

}

int main() {

    int result = multiply(4, 5);

    printf("Multiplication = %d", result);

    return 0;

}