[Solved] C Primer Plus 6th ed chapter 6 programming exercise 4

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Here you are:

#include <stdio.h>
#include <string.h>

int main( void )
{
    const char *s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    const size_t N = strlen(s);

    while (1)
    {
        printf("Enter a non-negative number (0 - exit): ");

        size_t n;
        if (scanf("%zu", &n) != 1 || n == 0) break;

        size_t k = 0;

        for (size_t i = 0; i < n; i++)
        {
            for (size_t j = 0; j <= i; j++)
            {
                printf("%c", s[ k++ % N ]);
            }
            putchar('\n');
        }
    }

    return 0;
}

The program output might look like:

Enter a non-negative number (0 - exit): 12
A
BC
DEF
GHIJ
KLMNO
PQRSTU
VWXYZAB
CDEFGHIJ
KLMNOPQRS
TUVWXYZABC
DEFGHIJKLMN
OPQRSTUVWXYZ
Enter a non-negative number (0 - exit): 0

2

solved C Primer Plus 6th ed chapter 6 programming exercise 4