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First Program in C language

A C program basically consists of following parts  :

  • Preprocessor Commands
  • Comments
  • Variables
  • Statements & Expressions
  • Functions

Steps to write and execute a c program : If  you want to create, compile and execute C programs by your own, you have to install C compiler in your machine. Then, you can start to execute your own C programs in your machine.
  • Create
  • Compile
  • Execute or Run
  • Get the Output

Lets see how to write a simple program in c language :


int main()

     /* our first simple c basic program */
     printf("Hello World"); 
     return 0;

Output :

Hello World 

Lets take a look at various parts of the above program : 

  • The first line o 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.