20140318_KUAS_VisualC++_Exam04

/************************************/
/** 20140318 Exam 04               **/
/** Maker  : Yan                    **/
/** E-Mail : [email protected] **/
/** Date   : 2014/03/18 pm.11:30    **/
/************************************/

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

void main()
{
    //定義變數, number_a, number_b 分別為輸入之兩數值
    int number_a = 0, number_b = 0;
    printf("Enter number, -1 is exit program.\n");

    //當number_a 或是 number_b \值不為-1 時執行迴圈
    while(number_a != -1 && number_b != -1)
    {
        //輸入number_a
        printf("Enter first  number: ");
        scanf("%d", &number_a);
        //強制特別條件: 當number_a 輸入為-1 時立即結束程式
        if(number_a == -1)
        {
            printf("Your Program is exiting ..\n");
            system("pause");
            return;
        }

        //輸入number_b
        printf("Enter second number: ");
        scanf("%d", &number_b);
        //強制特別條件: 當number_a 輸入為-1 時立即結束程式
        if(number_b == -1)
        {
            printf("Your Program is exiting ..\n");
            system("pause");
            return;
        }

        //定義變數min, min 為number_a 與number_b 之較小者
        int min = 0;
        if(number_a < number_b)
        {
            min = number_a;
        }
        else
        {
            min = number_b;
        }

        /*尋找公因數
          公因數之定義: 兩數能被一數值整除, 其數值即為兩數之公因數
          因公因數必比兩數小, 在此利用迴圈逐一檢查*/
        for(int i = 1; i <= min; i++)
        {
            //當迴圈數值i 可整除number_a 與number_b 時, 此數即為公因數而輸出
            if(number_a % i == 0 && number_b % i == 0)
            {
                if(i == 1)
                {
                    printf("%d", i);
                }
                else if(i != 1)
                {
                    printf(", %d", i);
                }

            }
        }
        printf("\n");
    }

    system("pause");
}