20140527_KUAS_VisualC++_Exam12

/************************************/
/** 20140527 Exam 12               **/
/** Maker  : Yan                   **/
/** E-Mail : [email protected] **/
/** Date   : 2014/05/27 am.11:40   **/
/************************************/

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

int processing(int, int);

void main()
{
    int x = 0, y = 0;
    printf("C(x, y), please input number of x & y.\n");
    printf("Enter a number of x: ");
    scanf("%d", &x);
    printf("Enter a number of y: ");
    scanf("%d", &y);
    printf("Answer = %d.\n", processing(x, y));
    system("pause");
}

int processing(int x, int y)
{
    if((y == 0) || (x == y))
    {
        return 1;
    }
    else
    {
        return processing(x - 1, y) + processing(x - 1, y - 1);
    }
}