First C Program

First C Program

Before we starting the abcd of C programming language, you need to learn how to write, compile and run the first c program.

• To write the first c program, open the C console and write the following code:

#include <stdio.h>  

#include <conio.h>  

void main(){  

printf("Hello C Language");  

  

getch();  

}  

1. #include <stdio.h> includes the standard input output library functions. The printf() function is defined in stdio.h .
2. #include <conio.h> includes the console input output library functions. The getch() function is defined in conio.h file.
3. void main() The main() function is the entry point of every program in c language. The void keyword specifies that it returns no value.
4. printf() The printf() function is used to print data on the console.
5. getch() The getch() function asks for a single character. Until you press any key, it blocks the screen.

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How to compile and run the c program

• There are 2 ways to compile and run the c program, by menu and by shortcut.

By menu

• Now click on the compile menu then compile sub menu to compile the c program.
• click on the run menu then run sub menu to run the c program.

By shortcut

• Or, press ctrl+f9 keys compile and run the program directly.
• You will see the following output on user screen.

• You can view the user screen any time by pressing the alt+f5 keys.
• Now press Esc to return to the turbo c++ console.

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clear screen by clrscr() function

• If you run the c program many times, it will append the output in previous output. But, you can call clrscr() function to clear the screen. 
• So it will be better for you to call clrscr() function after the main method as given below:

#include <stdio.h>  

#include <conio.h>  

void main(){  

clrscr();  

printf("Hello C Language");  

getch();  

}