问个图形打印的题目求指导

Question

要打印个空心等腰梯形，输入n为3，麻烦看下我的程序哪里错了

↵

#include

int main(void){
int n,i,j;
printf("Input n: ");
scanf("%d",&n);
for (i=1;i<=n;i++){
if (i==1||i==n){
for (j=1;j<=n-i;j++)
printf(" ");
for(j=n-j+1;j<=n+i+1;j++)
printf("*");
printf("\n");}
else
for (j=1;j<=n-i;j++){
printf(" ");
if (j==i||j==3*i+1)
printf("*");
printf("\n");}
}}

Answer 1

Input n: 6
     *******
    *       *
   *         *
  *           *
 *             *
*****************
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