谢尔宾斯基三角调试---C

Question

我正在开发一个基于用户输入的高度和分形级别打印谢尔宾斯基三角形的程序。这是我的程序在输入高度 8 和分形级别 1 时应该产生的结果：

       *
      ***
     *****
    *******
   *       *
  ***     ***
 *****   *****
******* *******

这是我目前所拥有的：

#include <stdio.h>
#include <stdlib.h>

int main(int argc, const char *argv[]) {

    int height, draw, errno, fractal_level;

    char *p;
    char *q;
    errno = 0;
    height = strtol(argv[1], &p, 10);
    fractal_level = strtol(argv[2],&q, 10);
    if (errno != 0 || p == argv[1]) {
        printf("ERROR: Height must be integer.\n");
        exit(1);
    }
    else if (errno != 0 || q == argv[2]) {
        printf("ERROR: Fractal Level must be integer.\n");
        exit(1);
    }
    int x,y;
    x=(2*height-1) / 2;
    y=(2*height-1) / 2;
    printf("x: %d   y: %d \n", x, y);
    drawSier(height, fractal_level, x, y);

    return 0;   
}

int drawSier(height, fractal_level, x, y) {

    //If the fractal level is zero, it's just a normal triangle.
    if (fractal_level==0)
    {
        drawTriangle(height, x, y);
    }
    //the function calls itself, but with a slight variance 
    //in the starting point of the triangle, for the top, bottom left, and bottom right
    else {
    //top
    drawSier(height/2, fractal_level-1, x, y);
    //bottom left
    drawSier(height/2, fractal_level-1, x-height/2, y-height/2);
    //bottom right
    drawSier(height/2, fractal_level-1, x+height/2, y-height/2);
    }
}

int drawTriangle(height, x, y){

    if (height<1) {
        printf("ERROR: Height too small.\n");
        exit(1);

    }
    else if (height>129) {
        printf("ERROR: Height too large.\n");
        exit(1);
    }

    for (int i = 1; i <= height; i++)
    {
        int draw=0;

        // this 'for' loop will take care of printing the blank spaces
        for (int j = i; j <= x; j++)
        {
            printf(" ");
        }
        //This while loop actually prints the "*"s of the triangle by multiplying the counter
        //by 2R-1, in order to output the correct pattern of stars. This is done AFTER the for
        //loop that prints the spaces, and all of this is contained in the larger 'for' loop.
        while(draw!=2*i-1) {
                printf("*");
                draw++;
        }
        draw=0;
        //We print a new line and start the loop again
        printf("\n");
    }

return 0;
}

这是我的程序当前使用相同输入生成的内容：

       *
      ***
     *****
    *******
   *
  ***
 *****
*******
           *
          ***
         *****
        *******

我不确定出了什么问题。这似乎是 y 变量的问题。

Answer 1

y 被传递给 drawTriangle() 但函数不使用它。它只是在之前打印的内容下方打印带有三角形的新行。

您可以在打印前使用控制台控制代码将光标移动到所需位置（注意不要覆盖以前打印的输出），或者您可以先在内存中创建完整的图像，最后再打印出来.