Input

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).
getch() is used for input of any character. 
For more information & explanation of this program click here.. 

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Program to input numbers.

#include<stdio.h>

#include<conio.h>

void main()

{

      int x;

      printf("Enter any no.");

      scanf("%d",x);
      getch();

}