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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <vector>
  4. #include <string>
  5.  
  6. int main()
  7. {
  8.     unsigned num_lines;
  9.     std::cout << "Enter the number of lines.\n> ";
  10.     std::cin >> num_lines;
  11.  
  12.     const unsigned width = 79;
  13.     std::vector<std::string> lines(num_lines);  // creates a vector of num_lines default constructed strings.
  14.  
  15.     for (unsigned i = 0; i < lines.size(); ++i)
  16.         lines[i] = std::string((width / 2 ) - (i * 2 + 1)/2, ' ') + std::string(i * 2 + 1, '*');
  17.  
  18.     std::cout << '\n' ;
  19.     for (unsigned i = 0; i < lines.size(); ++i)
  20.         std::cout << lines[i] << '\n';
  21. }
Success #stdin #stdout 0s 3480KB
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stdin
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20
stdout
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Enter the number of lines.
> 
                                       *
                                      ***
                                     *****
                                    *******
                                   *********
                                  ***********
                                 *************
                                ***************
                               *****************
                              *******************
                             *********************
                            ***********************
                           *************************
                          ***************************
                         *****************************
                        *******************************
                       *********************************
                      ***********************************
                     *************************************
                    ***************************************
https://ideone.com/RdBslj
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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