atoi - convert string to integer

Syntax	#include <stdlib.h> int atoi(const char *str);
Description	atoi() converts an EBCDIC string to which str points into an integer. The string to be converted may be formatted as follows: [{ tab | 'BLANK' }...] [+|-] digit ... All characters that produce white space are legal for tab (see isspace()). The atoi(str) function differs from strtol(str,(char**)NULL) only in error handling.
Return val.	Integer value of type int
		for strings formatted as described above and representing a numeric value that lies in the permissible range of integers.
	0	for strings that do not conform to the syntax described above.
	INT_MAX or INT_MIN
		in the case of an overflow, depending on the sign.
Notes	atoi() is completely contained in strtol(). However, the function continues to be offered because it is used in many existing applications. atoi() also recognizes strings that begin with digits but then end with any character. atoi() cuts off the numeric part, converts it according to the above description, and ignores the rest.
See also	atof(), atol(), strtod(), strtol(), strtoul(), stdlib.h.