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// Computation and output
std :: cout < < celsius < < " degrees Celsius are "
< < 9 * celsius / 5 + 32 < < " degrees Fahrenheit .\ n";
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9 * celsius / 5
2.2.2 Expression trees
9 * celsius / 5 + 32
32
9 * celsius
(9 * celsius) / 5
((9 * celsius) / 5) + 32
2.2.3 Evaluating expressions
celsius
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1 * 15 + 32
15 + 32
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