| atof | Converts strings to numbers. |
| char | Convert numbers to ASCII characters in strings. |
| string |
string converts a set of vectors through a format string in a string.
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| strlen | strlen returns the length of a string, i.e. the number of characters in the string. |
| strtok | strtok breaks the string in tokens. The second argument is a set of delimiters, i.e. characters that separate token. The delimiters themselfs are not returned. |
| substr | substr extracts a substring from a string. |