从给定的C/C++程序中删除注释-yiteyi-C++库

给定一个C/C++程序，从中删除注释。 我们强烈建议您尽量减少浏览器数量，并首先自己尝试。 其思想是维护两个标志变量，一个用于指示单行注释已启动，另一个用于指示多行注释已启动。设置标志后，我们会查找注释的结尾，并忽略开头和结尾之间的所有字符。下面是C++实现上述思想。

null

C

                         // C++ program to remove comments from a C/C++ program                       
                         #include <iostream>                       
                         using                                     namespace                                     std;                       
           
                         string removeComments(string prgm)                       
                         {                       
                                                 int                                     n = prgm.length();                       
                                                 string res;                       
           
                                                 // Flags to indicate that single line and multiple line comments                       
                                                 // have started or not.                       
                                                 bool                                     s_cmt =                                     false                                     ;                       
                                                 bool                                     m_cmt =                                     false                                     ;                       
           
           
                                                 // Traverse the given program                       
                                                 for                                     (                                     int                                     i=0; i<n; i++)                       
                                                 {                       
                                                 // If single line comment flag is on, then check for end of it                       
                                                 if                                     (s_cmt ==                                     true                                     && prgm[i] ==                                     ''                                     )                       
                                                 s_cmt =                                     false                                     ;                       
           
                                                 // If multiple line comment is on, then check for end of it                       
                                                 else                                     if                                     (m_cmt ==                                     true                                     && prgm[i] ==                                     '*'                                     && prgm[i+1] ==                                     '/'                                     )                       
                                                 m_cmt =                                     false                                     ,  i++;                       
           
                                                 // If this character is in a comment, ignore it                       
                                                 else                                     if                                     (s_cmt || m_cmt)                       
                                                 continue                                     ;                       
           
                                                 // Check for beginning of comments and set the appropriate flags                       
                                                 else                                     if                                     (prgm[i] ==                                     '/'                                     && prgm[i+1] ==                                     '/'                                     )                       
                                                 s_cmt =                                     true                                     , i++;                       
                                                 else                                     if                                     (prgm[i] ==                                     '/'                                     && prgm[i+1] ==                                     '*'                                     )                       
                                                 m_cmt =                                     true                                     ,  i++;                       
           
                                                 // If current character is a non-comment character, append it to res                       
                                                 else                                     res += prgm[i];                       
                                                 }                       
                                                 return                                     res;                       
                         }                       
           
                         // Driver program to test above functions                       
                         int                                     main()                       
                         {                       
                                                 string prgm =                                     "   /* Test program */ "                       
                                                 "   int main()  "                       
                                                 "   {           "                       
                                                 "      // variable declaration "                       
                                                 "      int a, b, c;    "                       
                                                 "      /* This is a test  "                       
                                                 "          multiline     "                       
                                                 "          comment for   "                       
                                                 "          testing */      "                       
                                                 "      a = b + c;       "                       
                                                 "   }           "                                     ;                       
                                                 cout <<                                     "Given Program "                                     ;                       
                                                 cout << prgm << endl;                       
                                                 cout <<                                     " Modified Program "                                     ;                       
                                                 cout << removeComments(prgm);                       
                                                 return                                     0;                       
                         }                       

输出

Given Program   /* Test program */   int main()   {      // variable declaration      int a, b, c;      /* This is a test          multiline          comment for          testing */      a = b + c;   } Modified Program   int main()   {             int a, b, c;          a = b + c;   }

本文由Sachin Gupta撰稿。如果您发现任何不正确的地方，或者您想分享有关上述主题的更多信息，请写评论

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