y1:空心菱形图案★

/*1.输入一个奇数n，输出对角线长为n的实心或者空心的菱形图案
  如当n=5时，有：
    *
   ***
  *****
   ***
    *
*/ 

1.

#include<stdio.h>
int main()
{
    int x,y,m,n;
    while(scanf("%d",&n)!=EOF){
        if(n%2==0)
            n++;
        m=(n-1)/2;
        for(y=0;y<=n-1;y++){
            for(x=0;x<=n-1;x++)
                if(x+y==m||x+y==3*m||x-y==m||y-x==m)
                    printf("*");
                else
                    printf(" ");
            printf(" ");
        }
    }
    return 0;
}

 

2.对称的方法

#include<stdio.h>
int main()
{
    int x,l,t1,t2,m,n;
    while(scanf("%d",&n)!=EOF){
        if(n%2==0)
            n++;
        m=n/2;
        for(l=0,t2=1;l>=0;l+=t2){
            for(x=0,t1=1;x>=0;x+=t1){
                if(x==m-l)
                    printf("*");
                else
                    printf(" ");
                if(x==m)
                    t1=-1;
            }
            printf(" ");
            if(l==m)
                t2=-1;
        }
    }
    return 0;
}