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ATOF(3) Library Functions Manual ATOF(3) NAME atof, atoi, atol, strtod, strtol, strtoul - convert ASCII to numbers SYNOPSIS double atof(nptr) char *nptr; int atoi(nptr) char *nptr; long atol(nptr) char *nptr; double strtod(nptr, rptr) char *nptr, **rptr; long strtol(nptr, rptr, base) char *nptr, **rptr; unsigned long strtoul(nptr, rptr, base) char *nptr, **rptr; DESCRIPTION Atof, atoi, and atol convert a string pointed to by nptr to floating, integer, and long integer representation respectively. The first un- recognized character ends the string. Atof recognizes an optional string of tabs and spaces, then an optional sign, then a string of digits optionally containing a decimal point, then an optional or followed by an optionally signed integer. Atoi and atol recognize an optional string of tabs and spaces, then an optional sign, then a string of decimal digits. Strtod, strtol, and strtoul, behave similarly to atof, and atol and, if rptr is not zero, set *rptr to point to the input character immediately after the string converted. Strtol and strtoul interpret the digit string in the specified base, from 2 to 36, each digit being less than the base. Digits with value over 9 are represented by letters, a-z or A-Z. If base is 0, the input is interpreted as an integral constant in the style of C (with no suf- fixed type indicators): numbers are octal if they begin with hexadeci- mal if they begin with or otherwise decimal. Strtoul does not recog- nize signs. SEE ALSO scanf(3) DIAGNOSTICS Zero is returned if the begining of the input string is not inter- pretable as a number. If overflow is detected by atof, strtod, strtol, or strtoul, a maximum value of the correct sign is returned and errno is set to ERANGE. BUGS Atoi and atol have no provisions for overflow. ATOF(3)