Program Structure with “Hello World” Example
Categories: C Programming language C language
Program Structure with “Hello World” Example
A C program basically consists of the following parts:
- Preprocessor Commands
- Functions
- Variables
- Statements & Expressions
- Comments
Let us look at a simple code that would print the words "Hello World":
|
#Include
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:
- 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.
- The next line int main() is the main function where the program execution begins.
- 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.
- The next line printf(...) is another function available in C which causes the message "Hello, World!" to be displayed on the screen.
- The next line return 0; terminates the main() function and returns the value 0.