Summary

Three types of expression have been introduced here;

• Arithmetic expressions are simple, but watch out for subtle type conversions. The shorthand notation may save you a lot of typing.
• Comparison takes two numbers and produces a logical result. Comparisons are usually found controlling if statements or loops.
• Logical connectors allow several comparisons to be combined into a single test. Lazy evaluation can improve the efficiency of the program by reducing the amount of calculation required.

C also provides a set of bit manipulation operators. These are quite specialised, so interested students would do well to check a textbook for details.