ASCII Histogram Printing

// Prints a histogram using the given `values` array.
// The supplied `values` array should have values in range [0.0, 1.0], and contain at least `nb_values` entries.
// `nb_values` represents the number of values to be printed (and thus the lengths of both arrays).
// `descriptions` must contain strings labelling each entry. At least `nb_values` strings are expected.
void print_histogram(double* values, uint8_t nb_values, char** descriptions) {
    for(int8_t slice = 9; slice != -1; slice--) {
        printf("%2d%% ", slice * 10);

        for(uint8_t valueID = 0; valueID < nb_values; valueID++) {

            putchar( (values[valueID] > (double)slice / 10) ? '|' : ' ');
            // Pad to the right
            for(uint8_t i = strlen(descriptions[valueID]); i != 0; i--) {
                putchar(' ');
            }

        }
        putchar('\n');
    }

    printf("    ");
    for(uint8_t valueID = 0; valueID < nb_values; valueID++) {
        printf("%s ", descriptions[valueID]);
    }
    putchar('\n');
}