Rotating Donut Ascii Art

Example taken from the following website https://www.a1k0n.net/2006/09/15/obfuscated-c-donut.html

Deof version by Lex Fridman https://youtu.be/DEqXNfs_HhY

Optimized version without math library dependency https://www.a1k0n.net/2021/01/13/optimizing-donut.html

• compile with gcc -o donut donut.c -lm

• It needs ANSI- or VT100-like terminal emulation (Linux,BSD,Mac,cygwin,minGW)

              k;double sin()
          ,cos();main(){float A=
        0,B=0,i,j,z[1760];char b[
      1760];printf("\x1b[2J");for(;;
    ){memset(b,32,1760);memset(z,0,7040)
    ;for(j=0;6.28>j;j+=0.07)for(i=0;6.28
  >i;i+=0.02){float c=sin(i),d=cos(j),e=
  sin(A),f=sin(j),g=cos(A),h=d+2,D=1/(c*
  h*e+f*g+5),l=cos      (i),m=cos(B),n=s\
  in(B),t=c*h*g-f*        e;int x=40+30*D*
  (l*h*m-t*n),y=            12+15*D*(l*h*n
  +t*m),o=x+80*y,          N=8*((f*e-c*d*g
  )*m-c*d*e-f*g-l        *d*n);if(22>y&&
  y>0&&x>0&&80>x&&D>z[o]){z[o]=D;;;b[o]=
  ".,-~:;=!*#$@"[N>0?N:0];}}/*#****!!-*/
    printf("\x1b[H");for(k=0;1761>k;k++)
    putchar(k%80?b[k]:10);A+=0.04;B+=
      0.02;}}/*****####*******!!=;:~
        ~::==!!!**********!!!==::-
          .,~~;;;========;;;:~-.
              ..,--------,*/