Question

The following code with line 18 commented, given this data:

1
3 3 1

yields

field 1 1
field 1 2
field 1 3
field 2 1
field 2 2
field 2 3
field 3 1
field 3 2
field 3 3

However if I leave the line as it is, it only executes the scanf(…) every second step. Where is the problem?

#include <stdio.h>

char field[102][102];

main()
{
    int t;
    scanf("%d",&t);
    while (t--)
    {
        int r, c, n, i, j;
        scanf("%d %d %d", &r, &c, &n); // wczytanie liczby wierszy, kolumn, dni
        for (i=1; i<=r; i++) // wiersze
        {
            for (j=1; j<=c; j++) // kolumny
            {
                printf("field %d %d\n", i, j);
                scanf("%c", &field[i][j]); // line 18 here
            }
        }
    }
    return 0;
}

Answer 1

The problem is that when you scan for a character you actually send two: the letter, which gets scanf-ed, and and “hidden” ‘\n’ which is read the next time. Just use a getch() after the scanf to read (and discard) that newline.