#include<stdio.h>
#include<stdlib.h>
int main()
{
    int i,j,x;
    printf("請輸入層數:");
    scanf("%d",&i);
    x=i*2-1;
    while (i <= x)
    {
          j = 1;
          while (j++ <=(x-i))
          printf(" ");
          j = x;
          while ((j++ - i) < i )
          printf("*");
          i++;
          printf("\n");
          }
          system("pause");
          return 0;
          }

請問一下  運算是要怎麼改