CS256 - Principles of Structured Design Fall 2021

Displaying ./code/cs256su21code/first/helloDet.c

/*
   this is a multiline comment
   comments are used to help other people
   understand your code

   the compiler will ignore everything in here

*/

//this is also a comment, but for single lines, the compiler ignores this line

#include <stdio.h>

/*
 #include is a preprocessor command that includes a header file(in this case
  stdio.h) from the C library before compiling a C program, we needed to have
  stdio.h in order to use printf
*/

//below is the "main" function, the very first function every C program calls
//"int" in this context means that the value returned by main will be an integer

int main() {

    //everything inside these curly braces  belongs to the main function

    printf("Hello, World!\n");
    //this function prints "Hello, World! and a new line onto the screen
    
    return 0; //return ends the program and returns 0
              //in this context, if it returns 0, the program worked!
}

/*

After finishing this program, you will then compile and then run the program

To compile this file, run the following command on the terminal: gcc hello.c

that will produce an executable named a.out, to run that type ./a.out to run the
program.

By default, the executables will be named a.out, to give your executable a name,
you will use the following format: gcc -o <name of executable> <source file>

So if you wanted to name the executable produced by compiling this source code
"hello" you would simply type "gcc -o hello hello.c" and that will produce an
executable named "hello"

*/