Hello World program in C language

Let’s begin writing with our first program i.e Hello World.

Type the following code in your editor or IDE:

// hello.c
#include <stdio.h>
int main() {
   printf("Hello, World!\n");
   return 0;
}

And, now if you are in IDE you can click Run button (in Windows) else run the hello.c C program(in macOS or Linux) as

$ gcc hello.c -o hello  # compile the C program

# run the compiled program as
$ ./hello
Hello, World!

Understanding Code

#include is a preprocessor command that tells the compiler to include the contents of stdio.h file which provide standard input and output operations.
The stdio.h file contains functions such as scanf() and printf() to take input and display output respectively.
main() function is the starting point of execution.
printf() is a library function to print formatted output to the screen.
The return 0; statement is the “Exit status” of the program which represents successful execution. return 1; represent failure in execution.

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