上下金字塔
#include<stdio.h>
main()
{int n,m,i,j,k,x;
while(scanf("%d",&n)!=EOF)
{for(i=1;i<=n;i++)
{for(j=1;j<=n-i;j++)
{printf(" ");}
for(k=1;k<=2*i-1;k++)
{printf("*");}
printf("\n");}
for(i=n-1;i>=1;i--)
{for(j=n-i;j>=1;j--)
{printf(" ");}
for(k=2*i-1;k>=1;k--)
{printf("*");}
printf("\n");}}}
main()
{int n,m,i,j,k,x;
while(scanf("%d",&n)!=EOF)
{for(i=1;i<=n;i++)
{for(j=1;j<=n-i;j++)
{printf(" ");}
for(k=1;k<=2*i-1;k++)
{printf("*");}
printf("\n");}
for(i=n-1;i>=1;i--)
{for(j=n-i;j>=1;j--)
{printf(" ");}
for(k=2*i-1;k>=1;k--)
{printf("*");}
printf("\n");}}}
