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Write a program <tt>hello</tt> which prints a greeting to the person
named on the command line. E.g.:
<pre><b>$</b> <i>./hello Joe</i></pre>
should print out
<pre>Hello, Joe!</pre>
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Engine
Template / Reference solution
 
#include <iostream>
#include <cstdlib>
using namespace std;
// main should accept command-line arguments
int main(\[int argc, char* argv[]]\) {
\[
   cout << "Hello, " << argv[1] << "!";
]\
   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 [{}]
 
[
   {"args": ["Joe"]},
   {"args": ["World"]},
   {"args": ["goodbye"]}
]
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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'.