Determine if a string is numeric: Difference between revisions
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m (→{{header|REXX}}: aligned comments, made REXX code compliant. -- ~~~~) |
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=={{header|REXX}}== |
=={{header|REXX}}== |
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<lang rexx>/*REXX program to determine if a string is numeric. */ |
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<lang REXX> |
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yyy=' -123.78' /*or some such.*/ |
yyy=' -123.78' /*or some such.*/ |
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/*Note: some REXX interpretors allow use of tab chars as blanks. */ |
/*Note: some REXX interpretors allow use of tab chars as blanks. */ |
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/*all statements below are equivalent.*/ |
/*all statements below are equivalent.*/ |
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if datatype(yyy)¬= 'NUM' then say 'oops, not numeric:' yyy |
if datatype(yyy)¬= 'NUM' then say 'oops, not numeric:' yyy |
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/*note: REXX only looks at the first char for DATATYPE's 2nd arg.*/ |
/*note: REXX only looks at the first char for DATATYPE's 2nd arg. */ |
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/*note: some REXX interpretors don't support the ¬ (not) character.*/ |
/*note: some REXX interpretors don't support the ¬ (not) character.*/</lang> |
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</lang> |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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