#include <stdio.h>

int main(){　　//int means the returned data type
  printf("hello world!\n"); // \n means a new line
  return 0; //the program worked as expected  
}

#include <stdio.h>
int main(){
  int x = 10;
  int y = x/2;
        
  printf("the magic number is: %i\n",y);    //"", is a format string, and %i inside means it‘s an integer, \n is new line, y is the variable you want to print
  printf("the magic number is: %i\nThe value x is: %i\n",y,x);//this will work too, first string,y and x are arguments
　　
　return 0;      
}//the first output is 5;