Problem 5-5 using the function of specified number of digits (15 minutes)

This question requires a simple statistical function integer number of specified numbers.

Function interface definition:

int CountDigit( int number, int digit );

 

Wherein numberis an integer of not more than long integer, digitis an integer within [0, 9] interval. Function CountDigitshould return numberthe digitnumber of occurrences.

Referee test program Example:

#include <stdio.h>

int CountDigit( int number, int digit );

int main()
{
    int number, digit;

    scanf("%d %d", &number, &digit);
    printf("Number of digit %d in %d: %d\n", digit, number, CountDigit(number, digit));

    return 0;
}

/* 你的代码将被嵌在这里 */

 

Sample input:

-21252 2

 

Sample output:

Number of digit 2 in -21252: 3

answer:

int CountDigit( int number, int digit ){
    int a[10]={0};
    if(number<0) number= -1*number;
    while(number>10) {
        a[number-(number/10)*10]++;
        number=number/10;
    }
    a[number]++;
    return a[digit];
}