C++

Hello World

#include
using namespace std;
int main() {
    

    cout<<"Hello world!\n";
    cout<<"Hello world from cout ...\n";
    return 0;

}

Fibonacci Number

Program to find the Fibonacci Number by making series of the fibonacci number and then getting fibonacci number by index.

#include 
#include  
using namespace std;


long fib(int index) {
    long number1 = 0; 
    long number2 = 1;
    long next_number = 0;
    if (index < 2)
        return index;
    else {
        for (int i = 0 ; i < index ; i += 1) {
            next_number = number1 + number2;
            number1 = number2;
            number2 = next_number;
        }
        return number1;
    }
               
}