C++字符画圈

样例输入

11Xo

6*E

样例输出

代码

#include <cstdio>
#define MAX 80 

char buf[MAX][MAX];
void mySwap(int& a, int& b)
{
    int temp = a;
    a = b;
    b = temp;
}
void drawLine(int x1, int y1, int x2, int y2, char ch)
{
    if (x1 == x2) {
        // 画直线 
        if (y1 > y2) mySwap(y1, y2);
        for (int j = y1; j <= y2; ++j) {
            buf[x1][j] = ch;
        }
    } else {
        // 画竖线
        if (x1 > x2) mySwap(x1, x2);
        for (int i = x1; i <= x2; ++i) {
            buf[i][y1] = ch;
        }         
    }
}
void drawCircle(int si, int sj, int width, char ch)
{
    drawLine(si, sj, si, sj + width - 1, ch);
    drawLine(si, sj + width - 1, si + width - 1, sj + width - 1, ch);
    drawLine(si, sj, si + width - 1, sj, ch);    
    drawLine(si + width - 1, sj, si + width - 1, si + width - 1, ch);    
}
int main()
{
    int width;
    char a, b; 
    
    while (scanf("%d", &width) != EOF) {
        scanf("%c%c", &b, &a);
        int x = 0, y = 0, cur = a;
        
        int tmpWidth = width;
        while (tmpWidth > 0) {
            drawCircle(x++, y++, tmpWidth, cur);
            tmpWidth -= 2;
            cur = (cur == a ? b : a);
        }
        
        buf[0][0] = buf[width - 1][width - 1] = buf[0][width - 1] = buf[width - 1][0] = ' ';
        for (int i = 0; i <= width - 1; ++i) {
            for (int j = 0; j <= width - 1; ++j) {
                printf("%c", buf[i][j]);
            }
            printf("
");
        }
    }
    
    return 0;
}