c - Why doesn't getchar() wait for me to press enter after scanf()?

I am learning C and I'm using "getchar()" to stop the
command windows so I can see the exercises am doing but it just doesn't work. heres a
sample:

#include
            

int main()
{
 int
            value;

 printf("1. option 1.\n2. option 2.\n3. option 3.\n4.
            Exit\n\nMake an option: ");
 scanf("%d", &value);
 switch
            (value)
 {
 case 1:
 printf("you selected the option
            1.");
 break;
 case 2:
 printf("you selected the option
            2.");
 break;

 case 3:
 printf("you selected
            the option 3.");
 break;
 case 4:

            printf("goodbye");
 break;
 default:
 printf("thats not an
            option");
 break;
 }

 getchar();

            return
            0;
}

this is
the output:

1. option 1.




2. option 2.


3. option 3.



4. Exit.

Make
an option: 1

you selected the option
1.

Process returned 0 (0x0) execution time :
3.453 s

Press any key to
continue.

Why
doesn't it wait for the input of "getchar()"?