heartFunction c语言

#include <stdio.h>

int main(int argc, char *argv[])
{
    float y,x,z,f;
    for(y = 1.5f;y > -1.5f;y -= 0.1f)
    {
        for(x = -1.5f;x < 1.5f; x += 0.05f)
        {
            z = x * x + y * y - ;
            f = z*z*z-x*x*y*y*y;
            putchar(f <= 0.0f ? ".:-=+*#%@"[(int)(f * (-8.0f))] : ' ');
        }
        putchar('\n');
    }

    //printf("Hello World!\n");
    return ;
}