Hello World Example

Hello World Example

A C program basically consists of the following parts:

· Pre-processor Commands· Functions· Variables· Statements & Expressions· Comments
Let us look at a simple code that would print the words "Hello World":

#include <stdio.h> int main() { /* my first program in C */ printf("Hello, World! \n"); return 0; }

Let us take a look at the various parts of the above program:

1. The first line of the program #include <stdio.h> is a preprocessor
command, which tells a C compiler to include stdio.h file before going to
actual compilation.

2. The next line int main() is the main function where the program execution
begins.

3. The next line /*...*/ will be ignored by the compiler and it has been put to
add additional comments in the program. So such lines are called
comments in the program.

4. The next line printf(...) is another function available in C which causes the
message "Hello, World!" to be displayed on the screen.

5. The next line return 0; terminates the main() function and returns the
value 0.