蓝桥杯历届试题 打印十字图

主要是把图形分析清楚，把循环理清楚就好。这里我是用了二维数组把图存下来，全都初始化为点号，然后通过循环来更改某些部分为$，最后输出二维数组。

#include<iostream>
#include<cstring>

using namespace std;

char num[130][130];

void tu(int n)
{
    int cont=n;
    int j=1;
    int row=9+(n-1)*4;
    for(int i = 3; i <= row/2+1; i=i+2)
    {
        num[j][i]=num[j+1][i]=num[j+2][i]='$';
        num[j][row-i+1]=num[j+1][row-i+1]=num[j+2][row-i+1]='$';
        num[row-j+1][i]=num[row-j][i]=num[row-j-1][i]='$';
        num[row-j+1][row-i+1]=num[row-j][row-i+1]=num[row-j-1][row-i+1]='$';
        
        num[j+2][i-1]=num[j+2][i-2]='$';
        num[j+2][row-i+2]=num[j+2][row-i+3]='$';
        num[row-j-1][i-1]=num[row-j-1][i-2]='$';
        num[row-j-1][row-i+2]=num[row-j-1][row-i+3]='$';
        
        int temp=i+1;
        while(temp<=row/2+1)
        {
            num[j][temp]=num[j][row-temp+1]=num[row-j+1][temp]=num[row-j+1][row-temp+1]='$';
            temp++;
        }
        j+=2;
        temp=j;
        while(temp<=row/2+1)
        {
            num[temp][i-2]=num[temp][row-i+3]=num[row-temp+1][i-2]=num[row-temp+1][row-i+3]='$';
            temp++;
        }
    }
    for(int i = 1; i <= row;i++)
    {
        for(int j = 1; j <= row; j++)
            cout<<num[i][j];
        cout<<endl;
    }
    
}
int main()
{
    int n;
    while(cin>>n)
    {
        memset(num,'.',sizeof(num));
        tu(n);
    }
    return 0;
}