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The post-increment and post-decrement operators increase (or decrease) the value of their operand by 1, but the value of the expression is the operand's value prior to the increment (or decrement) operation. In languages where increment/decrement is not an expression (e.g., Go), only one version is needed (in the case of Go, post operators only).
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In geometry, perpendicular lines a and b are denoted , and in projective geometry two points b and c are in perspective when while they are connected by a projectivity when . Infix notation is more difficult to parse by computers than prefix notation (e.g. + 2 2) or postfix notation (e.g. 2 2 + ).
Similarly, with 3*x++, where though the post-fix ++ is designed to act AFTER the entire expression is evaluated, the precedence table makes it clear that ONLY x gets incremented (and NOT 3*x). In fact, the expression (tmp=x++, 3*tmp) is evaluated with tmp being a temporary value. It is functionally equivalent to something like (tmp=3*x, ++x, tmp).
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3 4 2 × 1 5 −: ÷ + Discard matching parenthesis ^ Push token to stack: 3 4 2 × 1 5 − ^ ÷ + ^ has higher precedence than ÷ 2: Add token to output: 3 4 2 × 1 5 − 2 ^ ÷ + ^ Push token to stack: 3 4 2 × 1 5 − 2 ^ ^ ÷ + ^ is evaluated right-to-left 3: Add token to output: 3 4 2 × 1 5 − 2 3 ^ ^ ÷ + end: Pop entire stack to output ...
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