用C编程实现打印杨辉三角

#include<stdio.h>
#include<stdlib.h>
#define line 9
//第n行的m个数可表示为 C(n-1,m-1)，即为从n-1个不同元素中取m-1个元素的组合数。
//即为：num!/(count!*(num-count)!)   "!"为阶乘
 
int factorial(int z)  //阶乘
{
 int i,count_sum=1;
 for (i = 1; i <= z; i++)
 {
  count_sum *= i;
 }
 return count_sum;
}
int main()
{
 int num, count, kong;  //行号-num   数字-count 空格-kong  打印序号-xuhao
 for (num = 0; num < line; num++)
 {
  for (kong = line-num; kong > 0; kong--)
   printf("  ");
  for (count = 0; count <= num; count++)
   printf("%2d  ", factorial(num)/ (factorial(count)*factorial(num-count)));
  printf("\n");
 }
 system("pause");
 return 0;
}