请用while或if或for解决问题，带注释

请看16题，附答案，感谢指导
#include
int main()
{int i,j,k;
for (i=0;i<=3;i++)
{for (j=0;j<=2-i;j++)
printf(" ");
for (k=0;k<=2*i;k++)
printf("*");
printf("\n");
}
for (i=0;i<=2;i++)
{for (j=0;j<=i;j++)
printf(" ");
for (k=0;k<=4-2*i;k++)
printf("*");
printf("\n");
}
return 0;
}