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  1.     #include <string>
  2.     #include <array>
  3.     #include <vector>
  4.     #include <iostream>
  5.  
  6.     int main() {
  7.         std::array<std::string, 3> stringarray;
  8.         stringarray[0] = "hello";
  9.         stringarray[1] = "world";
  10.         // stringarray[2] contains an empty string.
  11.  
  12.         for (size_t i = 0; i < stringarray.size(); ++i) {
  13.             std::cout << "stringarray[" << i << "] = " << stringarray[i] << "\n";
  14.         }
  15.  
  16.         // Using a vector, which has a variable size.
  17.         std::vector<std::string> stringvec;
  18.  
  19.         stringvec.push_back("world");
  20.         stringvec.insert(stringvec.begin(), "hello");
  21.         stringvec.push_back("greetings");
  22.         stringvec.push_back("little bird");
  23.         std::cout << "size " << stringvec.size()
  24.                   << "capacity " << stringvec.capacity()
  25.                   << "empty? " << (stringvec.empty() ? "yes" : "no")
  26.                   << "\n";
  27.  
  28.         // remove the last element
  29.         stringvec.pop_back();
  30.         std::cout << "size " << stringvec.size()
  31.                   << "capacity " << stringvec.capacity()
  32.                   << "empty? " << (stringvec.empty() ? "yes" : "no")
  33.                   << "\n";
  34.  
  35.         std::cout << "stringvec: ";
  36.         for (auto& str : stringvec) {
  37.             std::cout << "'" << str << "' ";
  38.         }
  39.         std::cout << "\n";
  40.  
  41.         // iterators and string concatenation
  42.         std::string greeting = "";
  43.         for (auto it = stringvec.begin(); it != stringvec.end(); ++it) {
  44.             if (!greeting.empty()) // add a space between words
  45.                 greeting += ' ';
  46.             greeting += *it;
  47.         }
  48.         std::cout << "stringvec combined :- " << greeting << "\n";
  49.     }
  50.  
Success #stdin #stdout 0s 3276KB
comments (?)
stdin
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Standard input is empty
stdout
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stringarray[0] = hello
stringarray[1] = world
stringarray[2] = 
size 4capacity 4empty? no
size 3capacity 4empty? no
stringvec: 'hello' 'world' 'greetings' 
stringvec combined :- hello world greetings
https://ideone.com/LWYevW
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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