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  1. #include <string>
  2. #include <iostream>
  3. #include <fstream>
  4. #include <sstream>
  5. #include <vector>
  6. #include <cmath>
  7.  
  8. //disables any deprecation warning
  9. #pragma warning(disable : 4996)
  10.  
  11. //usings
  12. using std::vector;
  13. using std::string;
  14. using std::cout;
  15. using std::endl;
  16. using std::stringstream;
  17.  
  18. bool try_parse(const std::string& s)
  19. {
  20.     char* end = 0;
  21.     double val = strtod(s.c_str(), &end);
  22.     return end != s.c_str() && val != HUGE_VAL;
  23. }
  24.  
  25. char first_char(string str) {
  26.     return *str.c_str();
  27. }
  28.  
  29.  
  30. vector<string> tok_type(vector<string> vec) {
  31.     for (int i = 0; i < vec.size(); i++) {
  32.         string &s = vec[i];
  33.         bool doubly = try_parse(s);
  34.         bool amp = first_char(s) == '&';
  35.         if (!doubly && !amp) {
  36.             s = "<unknown> " + s;
  37.             continue;
  38.         }
  39.         else if (!doubly && amp) {
  40.             s = "<operator> " + s;
  41.             continue;
  42.         }
  43.         else if (doubly && !amp) {
  44.             s = "<double> " + s;
  45.             continue;
  46.         }
  47.     }
  48.     return vec;
  49. }
  50.  
  51. long double parse(string str) {
  52.     return std::stold(str);
  53. }
  54.  
  55. vector<string> split(string str, string token = " ") {
  56.     vector<string>result;
  57.     while (str.size()) {
  58.         int index = str.find(token);
  59.         if (index != string::npos) {
  60.             result.push_back(str.substr(0, index));
  61.             str = str.substr(index + token.size());
  62.             if (str.size() == 0)result.push_back(str);
  63.         }
  64.         else {
  65.             result.push_back(str);
  66.             str = "";
  67.         }
  68.     }
  69.     return result;
  70. }
  71.  
  72. string simplify(string expr) {
  73.     string iexpr = expr;
  74.     for (int i = 0; i < iexpr.length(); i++) {
  75.  
  76.         char& c = iexpr[i];
  77.  
  78.         if (c == '+')
  79.             iexpr.replace(i, 1, " &ad ");
  80.         else if (c == '-')
  81.             iexpr.replace(i, 1, " &sb ");
  82.         else if (c == '*') 
  83.             iexpr.replace(i, 1, " &mp ");
  84.         else if (c == '/')
  85.             iexpr.replace(i, 1, " &dv ");
  86.  
  87.     }
  88.     return iexpr;
  89. }
  90.  
  91. int main() {
  92.     vector<string> sep_rep = tok_type(split(simplify("21+32-3*2")));
  93.     for (auto str : sep_rep) {
  94.         cout << str << endl;
  95.     }
  96.  
  97.     std::cin.get();
  98.     return 0;
  99. }
Success #stdin #stdout 0s 4272KB
comments (?)
stdin
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Standard input is empty
stdout
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<double> 21
<operator> &ad
<double> 32
<operator> &sb
<double> 3
<operator> &mp
<double> 2
https://ideone.com/SkV1s3
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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