d4.c

包含3个小程序,逻辑判断,字符识别,及dos下可变半径圆的绘制

#include "math.h"
print(int i)
{ int j;
  for(j=1;j<=i;j++)
    printf(" ");
}
x()
{printf("*");
}
void d4()
{ int r,i,j; char p;
  printf("\n\nPlease input r= ");
  scanf("%d",&r);
  printf("\n\n\n\t");
  print(2*r);
  printf("* *\n");
  for(i=1;i<=r;i++)
   { printf("\t");
     j=2*r-2*sqrt(r*r-(r-i)*(r-i))+0.5;
     print(j);
     x();
     j=2*2*sqrt(r*r-(r-i)*(r-i));
     print(j);
     x();
     printf("\n");
   }
  for(i=r;i>=1;i--)
   { printf("\t");
     j=2*r-2*sqrt(r*r-(r-i)*(r-i))+0.5;
     print(j);
     x();
     j=2*2*sqrt(r*r-(r-i)*(r-i));
     print(j);
     x();
     printf("\n");
   }
  printf("\t");
  print(2*r);
  printf("* *\n");
  printf("\n\tPress any key to return: ");
  scanf("%c",&p);  scanf("%c",&p);
  return;
}