Functions in c plus plus

In C++, functions are blocks of code that perform specific tasks and can be called when needed. They help in organizing code, avoiding repetition, and improving readability.

Syntax of a Function in C++

return_type function_name(parameter_list) {
    // body of the function
    // return statement (if needed)
}

Example: Simple Function

#include<iostream>

using namespace std;

void greet() {
cout << “Hello, welcome to C++!” << endl;
}

int main() {
greet(); // function call
return 0;
}

Note:output of above code will be a message ” Hello, welcome to C++”.

A brief explanation of the difference between void and return-type functions in C++:

1.Void Function

• ‘void’ keyword shows that the function does not return a value.
• It is used when you just want to perform an action (like printing).
• Example:

void greet() {
    cout << "Hello!" << endl;
}

2.Return-Type Function

• when a function returns a value using the 'return' keyword in the end of body of function and ‘int’ / ‘double’ etc keywords are used in place of ‘void’ such functions fall under category of return type.
• It is useful when you need to get a result back from the function.

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

Types of Functions

1. User-defined functions – created by the programmer.
2. Standard library functions – built-in like sqrt(), pow(), etc.
   

Problems :

1. find sum of numbers from 1 to n

2.Calculate factorial of a number