Basic c program doesn't continue after the final scanf in the function, scanf just keeps accepting input endlessly

Here is relevant code:

I am somewhat new to the world of c so please help me out
The problem is at the bottom of the code: the divider = getchar()
this bit of code gets the program stuck and it never progresses after that it. Its just an infinite loop of allowing input. What is wrong. Please be specific as I am not entirely familiar with complex concepts (though I am eager to solve this issue no matter how complex the solution may be)

void read_in(int n, int m)
{

    int a = 0, b = 0, i = 0, x;

    while (a != n && b != m)

    {
        if (b == 0 && i == 0)
        {
            printf("\nEnter row %d:  ", a);

         }

         scanf("%d", &array[a][b]);

         diglength[a][b] = floor (log10 (abs (array[a][b]))) + 1;


         if (b == m - 1)
         {
             a++;            
             b = -1;
         }
         if (b == -1 && i != 0 && a != n)
         {
             printf("\nEnter row %d:  ", a);
         }


         i++;
         b++;
    }

    printf("\nEnter the number of new lines in between rows: ");
    scanf("%d", &newlines);
    printf("\nEnter the span of each array element: ");

    scanf("%d", &span);


    check_span(n, m);
    getchar();
    printf("\nEnter the type of justification (l - left   r - right): ");

    just = getchar();

    while (just != 'r' && just != 'l')
    {
        printf("\nInvalid argument");

        printf("\nEnter the type of justification (l - left   r - right): ");
        scanf(" %c", &just);
    }

    printf("\nEnter the character to be placed in between elements: ");
    getchar();
    divider = getchar();
//THE PROGRAM NEVER GETS PAST HERE IT GETS STUCK ON THE ABOVE CHARACTER ASSIGNMENT...WHY

    printf("it got here "); printf("%c", divider);    

}