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  1. #include <iostream>
  2. int main()
  3. {
  4.     std::cout << "Enter the natural number ";
  5.     int m;
  6.  
  7.     if (!(std::cin >> m)) {
  8.         std::cout << "Invalid entry\n";
  9.     } else {
  10.         for (int i = 1; i < m; i++) {
  11.             for (int j = 1; j < i; j++) {
  12.                 int rem = i + j;
  13.                 std::cout << rem << '\n';
  14.             }
  15.         }
  16.     }
  17. }
Success #stdin #stdout 0s 3144KB
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stdin
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Standard input is empty
stdout
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Enter the natural number Invalid entry
https://ideone.com/82EXtM
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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