如何从给定的C/C++程序中删除注释?

2021年4月8日17:32:53 发表评论 544 次浏览

给定一个C/C++程序, 从其中删除注释

强烈建议最小化你的浏览器, 然后自己尝试。

这个想法是要维护两个标志变量, 一个指示启动单行注释, 另一个指示启动多行注释。设置标记后, 我们将查找注释的结尾, 并忽略开始和结尾之间的所有字符。

以下是上述想法的C++实现。

//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 multpile 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] == '\n' )
             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 approproate 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 */\n"
                   "   int main()  \n"
                   "   {           \n"
                   "      //variable declaration \n"
                   "      int a, b, c;    \n"
                   "      /* This is a test  \n"
                   "          multiline     \n"
                   "          comment for   \n"
                   "          testing */     \n"
                   "      a = b + c;       \n"
                   "   }           \n" ;
     cout <<"Given Program \n" ;
     cout <<prgm <<endl;
     cout <<" Modified Program " ;
     cout <<removeComments(prgm);
     return 0;
}

输出如下

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提供。如果发现任何不正确的地方, 或者想分享有关上述主题的更多信息, 请发表评论。

被认为是行业中最受欢迎的技能之一, 我们拥有自己的编码基础C++ STL通过激烈的问题解决过程来训练和掌握这些概念。

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