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strtoul - STRTOUL(3 Linux Programmer’s Manual STRTOUL(3...

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STRTOUL(3) Linux Programmer’s Manual STRTOUL(3) NAME strtoul, strtoull, strtouq - convert a string to an unsigned long integer SYNOPSIS #include <stdlib.h> unsigned long int strtoul(const char * nptr , char ** endptr , int base ); unsigned long long int strtoull(const char * nptr , char ** endptr , int base ); DESCRIPTION The strtoul() function converts the initial part of the string in nptr to an unsigned long integer value accord- ing to the given base , which must be between 2 and 36 inclusive, or be the special value 0. The string must begin with an arbitrary amount of white space (as determined by isspace (3)) followed by a single optional ‘+’ or ‘-’ sign. If base is zero or 16, the string may then include a ‘0x’ prefix, and the num- ber will be read in base 16; otherwise, a zero base is taken as 10 (decimal) unless the next character is ‘0’, in which case it is taken as 8 (octal). The remainder of the string is converted to an unsigned long int value in the obvious manner, stopping at the first character which is not a valid digit in the given base. (In bases above 10, the letter ‘A’ in either
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