c语言中数字字符计数

#include <stdio.h>

int main(void)
{
    int i, ch;
    int cnt[10] = {};
    
    while((ch = getchar()) != EOF)
    {
        switch(ch)
        {
            case ‘0‘: cnt[0]++; break;
            case ‘1‘: cnt[1]++; break;
            case ‘2‘: cnt[2]++; break;
            case ‘3‘: cnt[3]++; break;
            case ‘4‘: cnt[4]++; break;
            case ‘5‘: cnt[5]++; break;
            case ‘6‘: cnt[6]++; break;
            case ‘7‘: cnt[7]++; break;
            case ‘8‘: cnt[8]++; break;
            case ‘9‘: cnt[9]++; break;
        }
    }
    
    puts("show the times.");
    for(i = 0; i < 10; i++)
    {
        printf("cnt[%d] = %d\n", i, cnt[i]);
    }
    
    return 0;
}