// Join items on output stream. (1.00)
 
#include <stdio.h>
 
void join(const void *base, size_t nitems, size_t itemsize,
          void (*putitem)(const void *item, FILE *stream),
          const char* separator, FILE *stream)
{
    const char *first = base, *last = first + nitems*itemsize;
    if (first != last) {
        for (;;) {
            putitem(first, stream);
            first += itemsize;
            if (first == last) break;
            fputs(separator, stream);
        }
    }
}
 
void put_int(const void *item, FILE *stream)
{
    fprintf(stream, "%d", *(const int *) item);
}
 
void print_ints(const int *a, size_t n, int end)
{
    putchar('[');
    join(a, n, sizeof *a, put_int, ", ", stdout);
    putchar(']');
    putchar(end);
}
 
int main(void)
{
    int a[] = {1, 2, 3, 4};
    print_ints(a, sizeof a / sizeof *a, '\n');
    return 0;
}

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