// Pantea Aria 

// functions
// write a function that prints "Hello World!"

#include <stdio.h>


// function prototype
void hello(void);
int main(void) {

    printf ("Hello world from the main function!\n");
    // call function hello
    hello();
    // call again
    hello();

    return 0;

}
// function definition/body
void hello(void) {
    printf ("Hello World from function hello\n");
    return;
}