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This section describes the following functions, macros and external variables:

• iconv - code conversion function
• iconv_close - deallocate code conversion descriptor
• iconv_open - allocate code conversion descriptor
• ieee2double - Convert floating-point number from IEEE format to /390 format (BS2000)
• ieee2float - Convert floating-point number from IEEE format to /390 format (BS2000)
• ilogb, ilogbf, ilogbl - get exponent part of floating-point number
• imaxabs - return integer absolute value (intmax_t)
• imaxdiv - division of integers (intmax_t)
• index - get first occurrence of character in string
• initgroups - initialize group access lists
• initstate, random, setstate, srandom - generate pseudo-random numbers
• insque, remque - Insert element in queue or remove element from queue
• ioctl - control devices and STREAMS
• isalnum - test for alphanumeric character
• isalpha - test for alphabetic character
• isascii - test for 7-bit ASCII character
• isastream - test file descriptor
• isatty - test for terminal device
• iscntrl - test for control character
• isdigit - test for decimal digit
• isebcdic - test for EBCDIC character (BS2000)
• isfinite - Macro to test for finite value
• isgraph - test for visible character
• islower - test for lowercase letter
• isinf - Macro to test for infinity
• isnan - test for NaN (not a number)
• isnormal - Macro to test for a normal value
• isprint - test for printing character
• ispunct - test for punctuation character
• isspace - test for white-space character
• isupper - test for uppercase letter
• iswalnum - test for alphanumeric wide character
• iswalpha - test for alphabetic wide character
• iswcntrl - test for control wide character
• iswctype - test wide character for class
• iswdigit - test for decimal digit wide character
• iswgraph - test for visible wide character
• iswlower - test for lowercase wide character
• iswprint - test for printing wide character
• iswpunct - test for punctuation wide character
• iswspace - test for white-space wide character
• iswupper - test for uppercase wide character
• iswxdigit - test for hexadecimal digit wide character
• isxdigit - test for hexadecimal digit