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  1.     #include <algorithm>
  2.     #include <string>
  3.     #include <iostream>
  4.     #include <cctype>
  5.     #include <functional>
  6.  
  7.     using namespace std;
  8.  
  9.     // A function object that will take a character, and append either "%20" or the 
  10.     // original character to our new string    
  11.     struct Converter
  12.     {
  13.     	std::string* pS;  // this points to our string we will build
  14.  
  15.     	Converter(std::string* s) : pS(s) {}
  16.  
  17.     	void operator()(char ch) 
  18.     	{
  19.     		if ( isspace(ch) )
  20.     			(*pS) += "%20";   // it's a space, so replace
  21.     		else
  22.     			*pS += ch;    // it is not a space, so use the same character
  23.     	}
  24.     };
  25.  
  26.     // trim spaces from end of string
  27.     std::string &rtrim(std::string &s) 
  28.     {
  29.     	s.erase(std::find_if(s.rbegin(), s.rend(), 
  30.                 std::not1(std::ptr_fun<int, int>(std::isspace))).base(), s.end());
  31.     	return s;
  32.     }
  33.  
  34.     // function to return the new string by looping over the original string 
  35.     string getNewString(const std::string& s)
  36.     {
  37.     	std::string outStr;  // our new string
  38.  
  39.         // loop over each character, calling our Coverter::operator()(char) function
  40.     	for_each(s.begin(), s.end(), Converter(&outStr));
  41.     	return outStr;
  42.     }
  43.  
  44.     int main()
  45.     {
  46.     	string instring = "This string has spaces ";
  47.         cout << getNewString(rtrim(instring));
  48.     }
  49.  
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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This%20string%20has%20spaces
https://ideone.com/kXPKgU
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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