loop.c

// Sentinel-controlled loop
// User will enter up to MAXSCORES test scores, or a -1 to finish.
// This loop cannot use breaks.

do {
    printf("Score %d: ", *nScores+1);
    scanf("%d", &userResponse); // Get the response
    if (userResponse >= 0) {
        scores[*nScores] = userResponse; // Save it
        *nScores = *nScores + 1;
    }
} while ((userResponse >= 0) && (*nScores < MAXSCORES));