实现函数y=x2的图形与圆的图形叠加显示

#include <stdio.h>
#include <math.h>

#define R 10
#define LINE 62
#define HIGHT 20


int
main()
{
    double y;
    int layer,x,m,n;

    for( layer=HIGHT; layer>=-R; --layer)
    {
        y=layer;
        m=(int)(1.5*sqrt(R*R-y*y));
        n=(int)( 5*sqrt(y));

        for(x=0; x<LINE; ++x)
        {
            if(y>=0)
           {
                  if(y>R)
                  {
                        if (x==31+n || x==31-n) printf("$");
                      else printf(" ");
                  }
                  else
                  {
                        if ((x==31+m && x==31+n)||
                            (x==31-m && x==31-n)) printf("+");
                   else if (x==31+m || x==31-m) printf("*");
                   else if (x==31+n || x==31-n) printf("$");
                      else printf(" ");
                  }

            }
            else
            {
                        if (x==31+m || x==31-m) printf("*");
                      else printf(" ");
            }
          }
          printf("\n");

    }

    return 0;
}

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