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// Computes average line length for standard input.
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import std.stdio;
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void main()
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{
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ulong lines = 0;
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double sumLength = 0;
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foreach (line; stdin.byLine()) {
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++lines;
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sumLength += line.length;
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}
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writeln("Average line length: ", lines ? sumLength / lines : 0);
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}
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