乱码大赛的一个例子:自注释代码

#include <stdio.h>
#include <math.h>
#define clear 1;if(c>=11){c=0;sscanf(_,"%lf%c",&r,&c);while(*++_-c);}\
  else if(argc>=4&&!main(4-(*_++=='('),argv))_++;g:c+=
#define puts(d,e) return 0;}{double a;int b;char c=(argc<4?d)&15;\
  b=(*_%__LINE__+7)%9*(3*e>>c&1);c+=
#define I(d) (r);if(argc<4&&*#d==*_){a=r;r=usage?r*a:r+a;goto g;}c=c
#define return if(argc==2)printf("%f\n",r);return argc>=4+
#define usage main(4-__LINE__/26,argv)
#define calculator *_*(int)
#define l (r);r=--b?r:
#define _ argv[1]
#define x

double r;
int main(int argc, char** argv){
  if(argc<2){
    puts(
      usage: calculator 11/26+222/31
      +~~~~~~~~~~~~~~~~~~~~~~~~calculator-\
      ! 7.584,367 )
      +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
      ! clear ! 0 ||l -x  l tan I (/) |
      +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
      ! 1 | 2 | 3 ||l  1/x  l cos I (*) |
      +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
      ! 4 | 5 | 6 ||l exp l  sqrt  I (+) |
      +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
      ! 7 | 8 | 9 ||l sin l log I (-) |
      +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(0
    );
  }
  return 0;
}

/*
解析:
best self documenting program : 最佳自我注释程序
寻找地址:
http://www.open-open.com/news/view/1e6f302#_label0

编译命令:
cc luanma.c -lm -o hou

./hou 11/26+222/31

./hou 'log((21701-19937)-(23209-21701))/log(2)'

./hou 'sin(1.5708)+0.04321+log(sqrt(exp(1*1*1)))+(1+2*3)-0.4-0.6+(4+6)*(2-1+2*3)-tan(0.785398)+2*10/3*6*sqrt(16/2/2)*10+10000-1000'

./hou '1+2*3'

./hou '(1+2)*3'
*/