统计调查结果 用两个数组完成

#include <stdio.h>
#define ANSWER_SIZE 20    /* The number of the answer */
#define STATISTICS_SIZE 10    /* The kinds of the answer */
int main(){
    int i_answer[] = { 2, 3, 4, 6, 7, 6, 10, 4, 8, 2, 2, 3, 9, 6, 9, 6, 10, 4, 8, 9 };    /* initialize the answer array */
    int i_statistics[STATISTICS_SIZE] = { 0 };    /* initialize the statistics array "0" */

    for (size_t i = 0; i <= (ANSWER_SIZE-1); i++){
        i_statistics[ i_answer[i]-1 ]++; /* traverse the answer array,
                                         the element value corresponding the statistics array`s subscript,
                                         and the relevant value +1 */
    }
    /* output the result */
    printf("%s%17s\n", "Grade", "Statistics");
    for (size_t i = 0; i <= (STATISTICS_SIZE-1); i++){
        printf("%d%17d\n", (i+1), i_statistics[i]);
    }

    return 0;
}