Conditional structures: Difference between revisions
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m (→{{header|REXX}}: added a couple of SELECT-END comment labels. -- ~~~~) |
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===switch=== |
===switch=== |
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<lang r>#Character input |
<lang r># Character input |
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calories <- function(food) switch(food, apple=47, pizza=1500, stop("food not known")) |
calories <- function(food) switch(food, apple=47, pizza=1500, stop("food not known")) |
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calories("apple") #47 |
calories("apple") # 47 |
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calories("banana") #throws an error |
calories("banana") # throws an error |
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#Numeric input |
# Numeric input |
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alphabet <- function(number) switch(number, "a", "ab", "abc") |
alphabet <- function(number) switch(number, "a", "ab", "abc") |
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alphabet(0) # null response |
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alphabet(1) # "a" |
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alphabet(2) # "ab" |
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alphabet(3) # "abc" |
alphabet(3) # "abc" |
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alphabet(4) # |
alphabet(4) # null response |
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#Note that no 'otherwise' option is allowed when the input is numeric.</lang> |
# Note that no 'otherwise' option is allowed when the input is numeric.</lang> |
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=={{header|Retro}}== |
=={{header|Retro}}== |
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