Difference between revisions of "Boolean Expressions"
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| − | Originally posted on the [[scipf: | + | Originally posted on the [[scipf:topic,646.html|SCI Programming]] forum by [[Gumby]] |
Boolean (true/false) expressions are handled as one might expect, with one subtlety. A value of 'true' is actually the result any expression evaluating to a non-zero value. I believe this is handled the same as most programming languages, but thought it was worth noting anyway. | Boolean (true/false) expressions are handled as one might expect, with one subtlety. A value of 'true' is actually the result any expression evaluating to a non-zero value. I believe this is handled the same as most programming languages, but thought it was worth noting anyway. | ||
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= x 1 | = x 1 | ||
| − | (if(x) | + | (if(x) // evaluates to true |
Print("True: x is non-zero") // this will be output | Print("True: x is non-zero") // this will be output | ||
)(else | )(else | ||
| Line 23: | Line 23: | ||
= x 9387 | = x 9387 | ||
| − | (if(x) // also evaluates to true | + | (if(x) // also evaluates to true |
Print("True: x is non-zero") // this will be output | Print("True: x is non-zero") // this will be output | ||
)(else | )(else | ||
| Line 29: | Line 29: | ||
) | ) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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| + | | ||
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| + | [[Category:Examples]] | ||
| + | [[Category:Syntax]] | ||
| + | [[Category:Conditionals]] | ||
Latest revision as of 20:11, 2 December 2015
Originally posted on the SCI Programming forum by Gumby
Boolean (true/false) expressions are handled as one might expect, with one subtlety. A value of 'true' is actually the result any expression evaluating to a non-zero value. I believe this is handled the same as most programming languages, but thought it was worth noting anyway.
To illustrate:
Code:
(var x)
= x 0
(if(x) // evaluates to false
Print("True: x is non-zero")
)(else
Print("False: x is zero") // this will be output
)
= x 1
(if(x) // evaluates to true
Print("True: x is non-zero") // this will be output
)(else
Print("False: x is zero")
)
= x 9387
(if(x) // also evaluates to true
Print("True: x is non-zero") // this will be output
)(else
Print("False: x is zero")
)
