来个去除c程序中的注释的小程序_去除所有注释的小程序-优快云博客

本文链接：https://blog.youkuaiyun.com/peniy/article/details/239537

该博客展示了一段C语言代码，实现了简单注释移除功能。代码通过状态机的方式，处理不同状态下的字符输入，包括注释、双引号和单引号内的内容，最终将处理后的字符输出，去除了代码中的注释。

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/**
* A simple comment remover.
*/

#include "stdio.h"
#include "stdlib.h"

void main()
{
    int c = 10;
    int pre;
    int state = 0;

while(c != EOF && (c=getchar())!= EOF)
{
     switch(state)
     {
         case 1:/*in comment*/
             while(c != EOF && state == 1)
             {
                 while(c !='*' && c != EOF)
                     c = getchar();
                 if(c == EOF)
                     return;
                 c = getchar();
                 if(c != EOF && c=='/')
                     state = 0;
                 else if(c !=EOF && c == '*')
                 {
                     while( (c = getchar()) != EOF && c == '*')
                         ;
                        if(c == '/')
                            state = 0;
                 }
             }
             break;
         case 2: /* in double quote*/
             while(c != EOF && state == 2)
             {
                 putchar(c);
                 while(c != EOF && c != '//' && c != '"')
                 {
                     c = getchar();
                     if(c != EOF)
                         putchar(c);
                 }
                 if(c == '//')
                 {
      if((c = getchar()) != EOF)
      {
       putchar(c);
       c = getchar();
      }

     }else if(c == '"')
                     state = 0;
             }
             break;
         case 3: /* in single quote */
             while(c != EOF && state == 3)
             {
                 putchar(c);
                 while(c != EOF && c != '//' && c != '/'')
                 {
                     c = getchar();
                     if(c != EOF)
                         putchar(c);
                 }
                 if(c == '//')
                 {
                     if((c = getchar()) != EOF)
      {
       putchar(c);
       /* it is no side effect, if "c" is not a escape character*/
       c = getchar();
      }

                 }else if(c == '/'')
                     state = 0;
             }
             break;
         case 0:/* normal*/
             while(c != EOF && state == 0)
             {
                 if(c == '"')
                 {
                     putchar(c);
                     state = 2;
                 }else if( c == '/'')
                 {
                     putchar(c);
                     state = 3;
                 }else if(c == '/')
                 {
                     int next = getchar();
                     if(next = '*')
                         state = 1;
                     else
                     {
                         putchar(c);/* c = '/' */
                         c = next;
                     }

     }else{
      putchar(c);
      c = getchar();
     }
             }
             break;
         default: /* should not goes here*/
             putchar(c);
     }
}

return;
}