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

• _a2e, _e2a - Convert from ASCII to EBCDIC and EBCDIC to ASCII (BS2000)
• _a2e_dup, _e2a_dup - Convert from ASCII to EBCDIC and EBCDIC to ASCII (BS2000)
• _a2e_dup_n, _e2a_dup_n - Convert from ASCII to EBCDIC and EBCDIC to ASCII (BS2000)
• _a2e_max, _e2a_max - Convert from ASCII to EBCDIC and EBCDIC to ASCII (BS2000)
• _a2e_n, _e2a_n - Convert from ASCII to EBCDIC and EBCDIC to ASCII (BS2000)
• a64l, l64a - convert string to 32-bit integer
• abort - abort process
• abs - return integer absolute value
• access, faccessat - check access permissions for file
• acos, acosf, acosl - arc cosine function
• acosh, acoshf, acoshl, asinh, asinhf, asinhl, atanh, atanhl, atanhf - inverse hyperbolic functions
• advance - pattern match given compiled regular expression
• alarm - schedule alarm signal
• altzone - variable for time zone (extension)
• ascii_to_ebcdic - convert ASCII string to EBCDIC string (extension)
• asctime - convert date and time to string
• asctime_r - convert date and time to string (thread-safe)
• asin, asinf, asinl - arc sine function
• asinh, asinhf, asinhl - inverse hyperbolic sine function
• assert - output diagnostic messages
• atan, atanf, atanl - arc tangent function
• atan2, atan2f, atan2l - arc tangent of x/y
• atanh - inverse hyperbolic tangent function
• atexit - register function to run at process termination
• atof - convert string to double-precision number
• atoi - convert string to integer
• atol - convert string to long integer
• atoll - convert string to long long integer (long long int)
• at_quick_exit - register function to run at process termination