统计调查结果 用两个数组完成

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1. #include <stdio.h>
   
2. #define ANSWER_SIZE 20    /* The number of the answer */
   
3. #define STATISTICS_SIZE 10    /* The kinds of the answer */
   
4. int main(){
   
5.     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 */
   
6.     int i_statistics[STATISTICS_SIZE] = { 0 };    /* initialize the statistics array "0" */
   
7. 
   
8.     for (size_t i = 0; i <= (ANSWER_SIZE-1); i++){
   
9.         i_statistics[ i_answer[i]-1 ]++; /* traverse the answer array,
   
10.                                          the element value corresponding the statistics array`s subscript,
    
11.                                          and the relevant value +1 */
    
12.     }
    
13.     /* output the result */
    
14.     printf("%s%17s\n", "Grade", "Statistics");    
    
15.     for (size_t i = 0; i <= (STATISTICS_SIZE-1); i++){
    
16.         printf("%d%17d\n", (i+1), i_statistics[i]);
    
17.     }
    
18. 
    
19.     return 0;
    
20. }