Difference between revisions of "Tonumber"
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{{Function | {{Function | ||
|name=tonumber | |name=tonumber | ||
| − | |args= | + | |args={{type|string}} number [<nowiki/>, {{type|number}} base] |
| + | |returns=None | ||
|addon=ComputerCraft | |addon=ComputerCraft | ||
| − | |desc= | + | |desc=Tries to convert its argument to a {{type|number}}. If the argument is already a number or a string convertible to a number, then '''tonumber''' returns this number; otherwise, it returns {{type|nil}}.<br><br> |
| + | |||
| + | An optional argument specifies the base to interpret the numeral. The base may be any integer between 2 and 36, inclusive. In bases above 10, the letter 'A' (in either upper or lower case) represents 10, 'B' represents 11, and so forth, with 'Z' representing 35. In base 10 (the default), the number can have a decimal part, as well as an optional exponent part. In other bases, only unsigned integers are accepted. | ||
|api= | |api= | ||
|examples= | |examples= | ||
{{Example | {{Example | ||
| − | |desc=Converts | + | |desc=Converts strings into numbers and adds them together. (It would be more intelligent to just save it as a number.) |
| − | |code=number1 = "10" | + | |code=local number1 = "10" |
| − | number2 = "5" | + | local number2 = "5" |
| − | print (number1, " + ", number2, " = ", tonumber (number1) + tonumber (number2)) | + | |
| + | [[print]](number1, " + ", number2, " = ", '''tonumber(number1)''' + '''tonumber(number2)''') | ||
|output = 10 + 5 = 15 | |output = 10 + 5 = 15 | ||
| − | |||
}} | }} | ||
}} | }} | ||
| + | |||
| + | [[Category:Lua_Core_Functions]] | ||
Latest revision as of 18:41, 10 April 2014
 Function tonumber | |
| Tries to convert its argument to a number. If the argument is already a number or a string convertible to a number, then tonumber returns this number; otherwise, it returns nil. An optional argument specifies the base to interpret the numeral. The base may be any integer between 2 and 36, inclusive. In bases above 10, the letter 'A' (in either upper or lower case) represents 10, 'B' represents 11, and so forth, with 'Z' representing 35. In base 10 (the default), the number can have a decimal part, as well as an optional exponent part. In other bases, only unsigned integers are accepted. | |
| Syntax | tonumber(string number [, number base]) |
| Returns | None |
| Part of | ComputerCraft |
| API | none |
Examples
 Example | |
| Converts strings into numbers and adds them together. (It would be more intelligent to just save it as a number.) | |
| Code |
local number1 = "10" local number2 = "5" print(number1, " + ", number2, " = ", tonumber(number1) + tonumber(number2)) |
| Output | 10 + 5 = 15 |
