计科男的表白方式

#include<stdio.h>
#include<math.h>
float f(float x,float y,float z)
{
float a=x*x+9.0f/4.0f*y*y+z*z-1;
return a*a*a-x*x*z*z*z-9.0f/80.0f*y*y*z*z*z;
}
float h(float x,float z)
{
for(float y=1.0f;y>=0.0f;y-=0.001f)
if(f(x,y,z)<=0.0f)
return 0.0f;
}
int main()
{
for(float z=1.5f;z>-1.5f;z-=0.05f)
{
for(float x=-1.5f;x<1.5f;x+=0.025f)
{
float v=f(x,0.0f,z);
if(v<=0.0f)
{
float y0=h(x,z);
float ny=0.01f;
float nx=h(x+ny,z)-y0;
float nz=h(x,z+ny)-y0;
float nd=1.0f/sqrtf(nx*nx+ny*ny+nz*nz);
float d=(nx+ny-nz)*nd*0.5f+0.5f;
putchar(".:-=+*#%@"[(int)(d*0.5f)]);
}
else
putchar('*');
}
putchar('\n');
}
}