Expressions are language constructs, that evaluate to a value, that can subsequently be echoed, tested in a conditional statement, assigned to a variable or passed to a function.
| • Constant expressions | String and Numeric Constants. | |
| • Function calls | A Function Call is an Expression. | |
| • Concatenation | String Concatenation. | |
| • Arithmetic operations | ‘+’, ‘-’, etc. | |
| • Bitwise shifts | ‘<<’ and ‘>>’. | |
| • Relational expressions | ‘=’, ‘<’, etc. | |
| • Special comparisons | matches, mx matches, etc.
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| • Boolean expressions | and, or, not.
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| • Precedence | How various operators nest. | |
| • Type casting |