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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
• _a2e_dup, _e2a_dup - Convert from ASCII to EBCDIC and EBCDIC to ASCII
• _a2e_dup_n, _e2a_dup_n - Convert from ASCII to EBCDIC and EBCDIC to ASCII
• _a2e_max, _e2a_max, - Convert from ASCII to EBCDIC and EBCDIC to ASCII
• _a2e_n, _e2a_n - Convert from ASCII to EBCDIC and EBCDIC to ASCII
• abort - Abnormal program termination
• abs - Absolute value of a whole number
• acos, acosf, acosl - Arc cosine
• alarm - Set alarm clock
• asctime - Date and time
• asin, asinf, asinl - Arc sine
• assert - Macro for diagnostics
• atan, atanf, atanl- Arc tangent
• atan2, atan2f, atan2l - Arc tangent of x/y
• atexit - Register termination routines
• atof - Convert a string into a floating-point number (double)
• atoi - Convert a string into an integer (int)
• atol - Convert a string into a whole number (long)
• atoll - Convert a string into a whole number (long long int)
• at_quick_exit - register function to run at process termination