怎样改，才能打出菱形来啊。

#include "stdio.h"
void main()
{
    int i,j,k,x,y;
   
    for(i=1;i<=20;i++)
    {
        if(i<=10)
        {
            for(j=1;j<=20-i;j++)
            {
                printf(" ");
            }
            for(k=1;k<2*i;k++)
            {
                printf("*");
            }
        }
        if(i>10)
        {
            for(x=1;x<=i;x++)
            {
                printf(" ");
            }
            for(y=1;y<=20-2*i;y++)   //逻辑错误
            {
                printf("*");
            }
        }
        printf("\n");
    }
   
正确如下
#include "stdio.h"
void main()
{
    int i,j,k,x,y;
   
    for(i=1;i<=20;i++)
    {
        if(i<=10)
        {
            for(j=1;j<=20-i;j++)
            {
                printf(" ");
            }
            for(k=1;k<2*i;k++)
            {
                printf("*");
            }
        
        }
        else if(i>10)
        {
            for(x=1;x<=i;x++)
            {
                printf(" ");
            }
            for(y=1;y<=2*(20-i);y++)    //改成这样
            {
                printf("*");
            }
            
        }
        printf("\n");
        
    }
   
   
   
}

这个问题太简单了

#include<stdio.h>
void main()
{
    int i,j,x,y,k,h,num; // num是行数, h是右移距离
    char change;
   
    for(;;)
    {
        printf("请依次输入菱形的行数、右移距离.注意行数一般为奇数，偶数自动加一行:\n");
        scanf("%d%d",&num,&h);
        printf("是否为空心y or n:\t");
        fflush(stdin);
        scanf("%c",&change);
        if(num+h>79||num<=1||change!='y'&&change!='n')
            printf("输入有误！！[行数+右移距离不能大于79，只识别y/n]请重新输入！\n");
        else break;
    }
   
    x=num/2+1;
    y=num/2;   
   
    for(i=0;i<=x-1;i++)
    {
        
        for(j=1;j<=x-1-i+h;j++)
        {
            printf(" ");
        }
        if(change=='y')
        {
            printf("*");
            for(k=3;k<=2*i+1;k++)
            {
                printf(" ");
            }
            if(i!=0)
                printf("*\n");
            else
                printf("\n");
        }
        if(change=='n')
        {
            for(k=1;k<=2*i+1;k++)
            {
                printf("*");
            }
            printf("\n");
        }
    }
   
    for(i=0;i<=y-1;i++)
    {
        
        for(j=0;j<=i+h;j++)
        {
            printf(" ");
        }
        if(change=='y')
        {
            printf("*");
            for(k=3;k<=2*(y-1)+1-2*i;k++)
            {
                printf(" ");
            }
            if(i!=y-1)
                printf("*\n");
            else
                printf("\n");
        }
        if(change=='n')
        {
            for(k=1;k<=2*(y-1)+1-2*i;k++)
            {
                printf("*");
            }
            printf("\n");
        }
    }
   
}

这个既能够打印实心菱形，还能够打印空心菱形，能够自选行数和右移距离（以中间那行为准）。编译过，正确的。

菱形的右下方多了一斜行下来啊。

温暖