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  1.     #include <iostream>
  2.     #include <string>
  3.  
  4.     std::string addTwoStrings(const std::string& a, const std::string& b)
  5.     {
  6.         return a + b; // works because they are both strings.
  7.     }
  8.  
  9.     void foo(const char* a, const char* b)
  10.     {
  11.         std::string str = a;
  12.         std::cout << "1st str = [" << str << "]" << std::endl;
  13.         str += " ";
  14.         std::cout << "2nd str = [" << str << "]" << std::endl;
  15.         str += b;
  16.         std::cout << "3rd str = [" << str << "]" << std::endl;
  17.         str = addTwoStrings(a, " ");
  18.         std::cout << "4th str = [" << str << "]" << std::endl;
  19.         str = addTwoStrings(str, b);
  20.         std::cout << "5th str = [" << str << "]" << std::endl;
  21.     }
  22.  
  23.     int main()
  24.     {
  25.         foo("hello", "world");
  26.     }
  27.  
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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1st str = [hello]
2nd str = [hello ]
3rd str = [hello world]
4th str = [hello ]
5th str = [hello world]
https://ideone.com/Ytohgs
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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