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Add (+), Subtract ( )
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+ adds an expression to another. If the two expressions are numbers then addition will occur. If the two expressions are strings then concatenation will occur. If the rst expression is a string and the second is a number then the second expression will be converted to a string and concatenated to the rst expression. If the rst expression is a number and the second is a string an error will occur. subtracts an expression from another. If either value is not a number an error will occur.
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Both operators have equal precedence and are evaluated from left to right if they are in sequence. Examples:
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Comparison (Relational) Operators Comparison operators compare one expression to another and return the value 0 if the result is false and 1 if the result is true. For example 5 > 4 results in 1 (true) but 5 > 10 results in 0 (false). The result of this type of operation is often used in ow-control statements to determine whether to take action or not. But the result of a comparison operation can be used anywhere an expression can be used, just as if it where a number (which it is, the number 0 or 1). Comparison operators have equal precedence and are evaluated from left to right. But it is very confusing if you combine comparison operators in an expression. If you need to do so, use logical operators (see below) for better clarity and use parenthesis to clarify the meaning. Many operators have multiple forms that perform the same operation. This way you can use any style you might be familiar with from other programming languages. All operators operate on string or number expressions but both expressions must be of the same type. Except, for the $ operator where the expressions can only be strings. If you compare two string expressions beware of lower and upper case letters. Letters are compared in order of their ASCII codes. Upper case letters have less value than lower case letters. Comparing strings may give a result you do not expect depending on the length of strings and the letters in the strings. For example Test is not equal to test ; it is less.
APPENDICES
In the following list true = 1 and false = 0 (see Sec. B.7.6). $ To see if the left string expression is contained within the right string expression. Both expressions must be strings or an error will result. For example, st $ testing returns true. To see if the left expression is greater than the right expression. For example, 5 > 4 returns true. To see if the left expression is less than the right expression. For example, 4 < 3 returns false. or = = To see if the left expression equals the right expression. For example, 4 = 7 returns false. To see if the left expression is greater than or equal to the right one. For example, 5 >= 7 returns false. To see if the left expression is less than or equal to the right one. For example, 5 <= 7 returns true. To see if the left expression is not equal to the right one. For example, 5 != 4 returns true.
> < =
>= or => <= or =< <> or >< or !=
Logical Operators Logical operators are usually used to combine results from comparison operators. A logical operator will consider the expressions it operates upon as false if the expression results in a zero, or true if the expression results in other than zero (negative or positive). You can perform logical operations on any numerical expressions. If any of the expressions results in a string an error occurs. All logical operators have equal precedence and will be evaluated from left to right if they occur in sequence. Use parenthesis if you are not sure how the combination will perform. There are two forms for each operator. This way you can use the style you are familh iar with. The letter formats are not case sensitive. So AND, and, AnD are th e same. Logical AND (AND, &&) For example (5 > 4) AND (4 < 3) (5 > 4) && (4 < 3) (5 > 4) AND (4 >= 3) (5 > 4) && (4 >= 3) Logical OR (OR , ||) R For example (5 < 4) OR (4 < 3) (5 < 4) | (4 < 3) | (5 > 4) OR ( 4 < 3) (5 > 4) | (4 < 3) |
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