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Write a program that prints out a multiplication table. It should
take an input <tt>n</tt>. The output
should have <tt>n</tt> rows and <tt>n</tt> columns, and be 
formatted in 4-space wide 
columns, like this example output when the input <tt>n</tt> is 5:
<pre>
   1   2   3   4   5
   2   4   6   8  10
   3   6   9  12  15
   4   8  12  16  20
   5  10  15  20  25
</pre>
Use <tt>cout << setw(4) << [thing you want to print]</tt> with each item printed, in order to get the column-based layout.
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Engine
Template / Reference solution
 
#include <iostream>
#include <iomanip>
using namespace std;
int main() {
   // get the input
   int n;
   cin >> n;
   // to print out fixed-width columns, print out each item with
   // cout << setw(4) << "item"; // see page 49
\[
   for (int j=1; j<=n; j++) {
      // print items in a row
      for (int i=1; i<=n; i++)   
         cout << setw(4) << i*j;
      // end the row
      cout << endl;
   }
]\
   return 0;
}
C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]},
{"stdin":"noargs"}]

to just run once with no input use [{}]
 
[
   {"stdin": "5"},
   {"stdin": "10"},
   {"stdin": "15"}
]
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Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.