程序功能:读入用户输入的一个长整型数值.检测该数字是否有重复的部分:
#include <stdio.h>

#define TRUE 1
#define FALSE 0

typedef int Bool;

int main (void)

{
    Bool digit_seen[10] = {0} ;
    int digit;
    long int n;

    printf("Enter a number: ");
    scanf("%ld",&n);

    while (n > 0)
    {
        digit =  n % 10;

        if (digit_seen[digit])
        break ;
        digit_seen[digit] = TRUE;
        n /= 10;
    }
    if (n > 0)
        printf("Repeated digit\n\n");
    else
        printf("No repeated digit\n\n");

        getch();

        return 0;
    }

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