用c语言编写18, 用双重循环打印如下图形. * *** ***** ******* ***** *** *

Answer 1

#include<stdio.h>
#define n 3
int main()
{
int i,j;
for(i=0;i<=n;i++)
{
for(j=1;j<=n-i;j++)
printf(" ");
for(j=1;j<=2*i+1;j++)
printf("*");
printf("\n");
}
for(i=n-1;i>=0;i--)
{
for(j=1;j<=n-i;j++)
printf(" ");
for(j=1;j<=2*i+1;j++)
printf("*");
printf("\n");
}
}

Answer 2

void printstar(int n)
{
if(n%2==0)
return;
int i=0;
int j=1;
int k=2;
while(j>0)
{
i = 0;
while(i<j)
{
cout<<"*";
i++;
}
cout<<" ";
if(j==n)
{
k=-2;
}
j=j+k;
}
cout<<endl;
}