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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. int main()
  5. {
  6.     std::cout << "Enter size of the array.\n> ";
  7.  
  8.     std::size_t dim;
  9.     std::cin >> dim;
  10.  
  11.     std::vector<std::vector<double>> matrix(dim, std::vector<double>(dim));
  12.  
  13.     std::cout << "Enter the elements of the array.\n> ";
  14.     for (std::size_t row = 0; row < dim; ++row)
  15.         for (std::size_t col = 0; col < dim; ++col)
  16.             std::cin >> matrix[row][col];
  17.  
  18.     std::cout << "The elements we're concerned with:\n";
  19.  
  20.     for (std::size_t row = 0; row < dim; ++row) {
  21.         for (std::size_t col = 0; col < row; ++col)
  22.             std::cout << matrix[row][col] << ' ';
  23.         std::cout << '\n';
  24.     }
  25. }
Success #stdin #stdout 0s 3476KB
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stdin
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stdout
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Enter size of the array.
> Enter the elements of the array.
> The elements we're concerned with:

5 
9 10 
13 14 15
https://ideone.com/UzGn98
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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