顶三楼！

#include <stdio.h>
int main()
{
    int a[30][30],i,j,n;
    while (scanf("%d",&n)!=EOF)
    {
        for (i=0;i<n;i++)
        {
            for (j=0;j<=i;j++)
            {
                if (i==j||j==0)
                    a[i][j]=1;
                else
                    a[i][j]=a[i-1][j-1]+a[i-1][j];
            }
        }
        for (i=0;i<n;i++)
        {
            for (j=0;j<=i;j++)

            {   if (j!=i)
                    printf("%d ",a[i][j]);
                else
                    printf("%d",a[i][j]);
            }
            printf("\n\n");
        }
        printf("\n");
    }
  return 0;  
}
想要输出及行  就输入几