Input and Print

In this program, # is a preprocessor directive ,  whereas #include is used to extract the 
functions already created in files (eg:- conio.h contains getch() function). int x statement
declares variable named as x.

Line printf prints the whole statement written inside it. scanf() statement is used to take
input from user 7 store it in x (variable to store value).

printf () statement again prints the variable (%d is used to display int type variable) . 
getch() is used for input of any character.
For more information & explanation of this program click here..  

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Program to input number and print.

#include<stdio.h>

#include<conio.h>

void main()

{       int a;

clrscr();

printf("program to input a no. & display it : ");

printf("\n\n enter value of a : ");

scanf("%d",&a);

printf("value of no. entered = %d",a);

getch();

}