atol() -- convert string to a long integer

SYNOPSIS

#include <stdlib.h>

long atol(const char *nptr);

The atol() function converts a string representing an integer to a long integer. The string to be converted consists of optional leading white space, an optional sign and a series of contiguous digits.

The call atol(nptr) is equivalent to:

strtol(nptr,(char **)NULL, 10)

PARAMETERS

nptr: Points to a string to be converted to a long.

RETURN VALUES

The atol() function returns the converted long value.

If the converted value overflows, LONG_MIN or LONG_MAX is returned (according to the sign of the value) and errno is set to ERANGE. If no character could be converted, zero is returned.