C Programming beginners, Local Variable declaration

getch() is the function which scans single key stroke.
so it'll be used to check output at the end of execution of program.

conio.h : Console input output
stdio.h  : Standar input output

printf() is declared in stdio.h file while getch() is declared in conio.h file.

//Use of getch()

#include<conio.h>
#include<stdio.h>
void main()
{
   printf("Hello World...!!!");
   getch();
}



//Simple variable declaration

#include<conio.h>
#include<stdio.h>
void main()
{
   int a;
   clrscr();// clear screen - clears previous screen out put

   a=10;
   printf("Value of a:%d",a);
   getch();
}

output :

Value of a:10

//Multiple variable declaration

#include<conio.h>
#include<stdio.h>
void main()
{
   int a,b;
   clrscr();// clear screen - clears previous screen out put

   a=10;
   b=22;
   printf("Value of a:%d",a);
   printf("Value of b:%d",b);
   printf("\n");//\n to print next statement in new line
   printf("Value of a:%d and b:%d\n",a,b);
   printf("Value of a:%d and b:%d\n",b,a);
   getch();
}

output :

Value of a:10Value of b:22

Value of a:10 and b:22

Value of a:22 and b:10