miniany/test4.c


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/* test4: test floats and draw an ASCII mandelbrot
   from: https://miyuki.github.io/2017/10/04/gcc-archaeology-1.html
   (original authorship missing) */

int main( )
{
    float r, i, R, I, b;
    int n;
  
    for( i = -1; i < 1; i += .06, putnl( ) ) {
        for( r = -2; I = i, (R = r) < 1; r += .03, putchar( n + 31 ) ) {
            for( n = 0; b = I * I, 26 > n++ && R * R + b < 4;
                I = 2 * R * I + i, R = R * R - b + r );
        }
    }
    
    exit( EXIT_SUCCESS );
}