C++ Programming/Code/Standard C Library/Functions/strtol
strtol
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#include <cstdlib>
long strtol( const char *start, char **end, int base );
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The strtol() function returns whatever it encounters first in start as a long, doing the conversion to base if necessary. end is set to point to whatever is left in start after the long. If the result can not be represented by a long, then strtol() returns either LONG_MAX or LONG_MIN. Zero is returned upon error.