20140514_KUAS_VisualC++_Classwork_0507_Question1_Answer

/***********************************************/
/** 20140514 Classwork_0507 Question 1 Answer **/
/** Maker  : Yan                              **/
/** E-Mail : [email protected]            **/
/** Date   : 2014/05/14 am.04:39              **/
/***********************************************/

#include <stdio.h>
#include <stdlib.h>

void change(int ,int, int, int);

void main()
{
    while(1)
    {
        int target = 0, base = 0, count = 1, answer = 0;
        printf("Enter a number of target: ");
        scanf("%d", &target);
        if(target == 0)
        {
            break;
        }
        printf("Enter a number of base: ");
        scanf("%d", &base);
        change(target, base, count, answer);
    }
    printf("Your Program is exiting ..\n");
    system("pause");
}

void change(int target, int base, int count, int answer)
{
    int subtrahend = 0;
    if(target >= base)
    {
        while(subtrahend + base <= target)
        {
            subtrahend += base;
        }
        answer = (target - subtrahend) * count + answer;
        target = subtrahend / base;
        count *= 10;
        //debug
        //printf("%d, %d, %d, %d\n", target, base, count, answer);
        change(target, base, count, answer);
    }
    else if(target < base)
    {
        answer = (target - subtrahend) * count + answer;
        printf("Answer = %d.\n\n", answer);
    }
}