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The '''~''' operator works as follows: | The '''~''' operator works as follows: | ||
* The result is true if the | * The result is true if the operand is false | ||
* The result is false if the | * The result is false if the operand is true. | ||
The '''~''' operator is equivalent to the '''NOT''' operator, with one difference: ~ works everywhere whereas NOT will only work in If and PRINT statements | The '''~''' operator is equivalent to the '''NOT''' operator, with one difference: ~ works everywhere whereas NOT will only work in If and PRINT statements | ||
'''~''' is usually used in conjunction with an [[If]] [[statement]]. | '''~''' is usually used in conjunction with an [[If]] [[statement]]. | ||
The following examples demonstrates the use of '''~''': | |||
00010 let x = 1 ! same as true | |||
00020 let y = ~x ! not true evaluates to false, which is 0 in BR | |||
00010 let result = ( 2 < 5 ) ! 2 < 5 evaluates to true, which is 1 in BR | |||
00020 print result ! since result is 1, that's what will print on the screen | |||
<noinclude> | <noinclude> | ||
Revision as of 14:39, 9 January 2012
The logical unary negation operator ~ reverses the meaning of its operand. The operand must be numeric. Note that in BR, 1 means true and 0 means false.
The ~ operator works as follows:
- The result is true if the operand is false
- The result is false if the operand is true.
The ~ operator is equivalent to the NOT operator, with one difference: ~ works everywhere whereas NOT will only work in If and PRINT statements
~ is usually used in conjunction with an If statement.
The following examples demonstrates the use of ~:
00010 let x = 1 ! same as true 00020 let y = ~x ! not true evaluates to false, which is 0 in BR
00010 let result = ( 2 < 5 ) ! 2 < 5 evaluates to true, which is 1 in BR 00020 print result ! since result is 1, that's what will print on the screen