P123 第三章 30题 杨辉三角

/* Note:Your choice is C IDE */
#include "stdio.h"
void line(int a,int b)
{
	int m = a,n = b;
	int s = 1,t = 1;
	int consult,c;
	b = b-1;
	a = a-1;
	c = b;
	for(b; b > 0; b--)	  s = s*b;
	for(c; c > 0; c--)  
	{
		t = t*a;
		a--;
	}
	consult = t/s;
	 printf("第%d行第%d列的数为：%d",m,n,consult);
}


void main()
{
	int x,y;//x,y都等于1的话，数为1，程序没有设置
	printf("请输入第几行：");
	scanf("%d",&x);
	printf("请输入第几列：");
	scanf("%d",&y);
	line(x,y);
}