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Variable declarations in while loop conditions are also C++-only.

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Compilation time: 0.22 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,36 sec 
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Warning(s):
source_file.cpp:16:11: warning: use of old-style cast [-Wold-style-cast]
    srand((unsigned)time(NULL));
          ^         ~~~~~~~~~~
1 warning generated.
Here's a handful of "random" numbers from 1 to 9:
5
9
7
8
2
4
8
4
9
8
2
6
Done.