编写程序显示每种数字在一个数中出现的次数

要求：显示一张列表，表内显示出每种数字在数中出现的次数，示例如下:

#include <stdio.h>
 
#define TURE 1
#define FALSE 0

typedef int Bool;

main() {
    Bool digit_seen[10] = { 0 };
    int digit, i;
    long int n;
    const int num[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
            
    printf("Enter a number:");    
    scanf("%ld", &n);
    printf("Digit:         ");
    for (i = 0; i < 10; i++) 
        printf("%4d",num[i]);
    printf("\nOccurrences:   ");    
    while (n > 0) {
        digit = n % 10;
        digit_seen[digit]++;
        n /= 10;        
    }
    for (i = 0; i < 10; i++) 
        printf("%4d",digit_seen[i]);    
    return 0;
}