Query: atoi
OS: suse
Section: 3p
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
ATOI(3P) POSIX Programmer's Manual ATOI(3P)PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.NAMEatoi - convert a string to an integerSYNOPSIS#include <stdlib.h> int atoi(const char *str);DESCRIPTIONThe call atoi(str) shall be equivalent to: (int) strtol(str, (char **)NULL, 10) except that the handling of errors may differ. If the value cannot be represented, the behavior is undefined.RETURN VALUEThe atoi() function shall return the converted value if the value can be represented.ERRORSNo errors are defined. The following sections are informative.EXAMPLESConverting an Argument The following example checks for proper usage of the program. If there is an argument and the decimal conversion of this argument (obtained using atoi()) is greater than 0, then the program has a valid number of minutes to wait for an event. #include <stdlib.h> #include <stdio.h> ... int minutes_to_event; ... if (argc < 2 || ((minutes_to_event = atoi (argv[1]))) <= 0) { fprintf(stderr, "Usage: %s minutes ", argv[0]); exit(1); } ...APPLICATION USAGEThe atoi() function is subsumed by strtol() but is retained because it is used extensively in existing code. If the number is not known to be in range, strtol() should be used because atoi() is not required to perform any error checking.RATIONALENone.FUTURE DIRECTIONSNone.SEE ALSOstrtol(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .IEEE/The Open Group 2003 ATOI(3P)
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