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class TStr2PPN {
    AnsiString instr, outstr;     //input & output strings
    char curc;                    //the current character
    int iin;                      //the index of the input string
 
    char nextChar();              //get the next character
    void begin();                 //handle plus & minus
    void mult_div();              //handle multiplication & division
    void symbol();                //handle characters & brackets
 
  public:
    TStr2PPN() {                  //constructor
       iin = 1;
    }
 
    void convert(char *str);      //convert to PPN
    AnsiString get_outstr();      //get the output string
};
 
 
//get the next character
inline char TStr2PPN::nextChar() {
   if(iin <= instr.Length()) return curc = instr[iin++];
   return curc = '\0';
}
 
//get the output string
inline AnsiString TStr2PPN::get_outstr(){return outstr;}
 
//convert to PPN
void TStr2PPN::convert(char *str) {
   try {
      instr = str;
      outstr.SetLength(0);
      iin = 1;
      nextChar();
      //begin the convertation
      begin();
      if(iin != (instr.Length()+1) || curc != '\0') {
         throw Exception("Syntax error");
      }
      if(!isalpha(instr[instr.Length()]) && instr[instr.Length()]!=')') {
         throw Exception("Syntax error");
      }
   }
   catch(...) {throw;}
}
 
//handle plus & minus
void TStr2PPN::begin() {
   try {
       mult_div();
       while(curc=='+' || curc=='-') {
          char temp = curc;
          nextChar();
          mult_div();
          outstr += temp;
       }
   }
   catch(...) {throw;}
}
 
//handle multiplication & division
void TStr2PPN::mult_div() {
   try {
       symbol();
       while(curc=='*' || curc=='/') {
          char temp = curc;
          nextChar();
          symbol();
          outstr += temp;
       }
   }
   catch(...) {throw;}
}
 
//handle characters
void TStr2PPN::symbol() {
   try {
      if(curc=='(') {
         nextChar();
         begin();
         if(curc!=')') {
            throw Exception("Error: wrong number of brackets");
         }
         else nextChar();
      }
      else
         if(isalpha(curc)) {
            outstr += curc;
            nextChar();
         }
         else {throw Exception("Syntax error");}
   }
   catch(...) {throw;}
}

prog.cpp:2:5: error: ‘AnsiString’ does not name a type
     AnsiString instr, outstr;     //input & output strings
     ^~~~~~~~~~
prog.cpp:17:5: error: ‘AnsiString’ does not name a type
     AnsiString get_outstr();      //get the output string
     ^~~~~~~~~~
prog.cpp: In member function ‘char TStr2PPN::nextChar()’:
prog.cpp:23:14: error: ‘instr’ was not declared in this scope
    if(iin <= instr.Length()) return curc = instr[iin++];
              ^~~~~
prog.cpp: At global scope:
prog.cpp:28:8: error: ‘AnsiString’ does not name a type
 inline AnsiString TStr2PPN::get_outstr(){return outstr;}
        ^~~~~~~~~~
prog.cpp: In member function ‘void TStr2PPN::convert(char*)’:
prog.cpp:33:7: error: ‘instr’ was not declared in this scope
       instr = str;
       ^~~~~
prog.cpp:34:7: error: ‘outstr’ was not declared in this scope
       outstr.SetLength(0);
       ^~~~~~
prog.cpp:40:40: error: ‘Exception’ was not declared in this scope
          throw Exception("Syntax error");
                                        ^
prog.cpp:42:40: error: ‘isalpha’ was not declared in this scope
       if(!isalpha(instr[instr.Length()]) && instr[instr.Length()]!=')') {
                                        ^
prog.cpp:43:40: error: ‘Exception’ was not declared in this scope
          throw Exception("Syntax error");
                                        ^
prog.cpp: In member function ‘void TStr2PPN::begin()’:
prog.cpp:57:11: error: ‘outstr’ was not declared in this scope
           outstr += temp;
           ^~~~~~
prog.cpp: In member function ‘void TStr2PPN::mult_div()’:
prog.cpp:71:11: error: ‘outstr’ was not declared in this scope
           outstr += temp;
           ^~~~~~
prog.cpp: In member function ‘void TStr2PPN::symbol()’:
prog.cpp:84:62: error: ‘Exception’ was not declared in this scope
             throw Exception("Error: wrong number of brackets");
                                                              ^
prog.cpp:89:25: error: ‘isalpha’ was not declared in this scope
          if(isalpha(curc)) {
                         ^
prog.cpp:90:13: error: ‘outstr’ was not declared in this scope
             outstr += curc;
             ^~~~~~
prog.cpp:93:46: error: ‘Exception’ was not declared in this scope
          else {throw Exception("Syntax error");}
                                              ^

Standard output is empty