### Functions and Macros: "A"

Function/Macro | #include file | ANSI/ISO | ANSI/ISO 93 | POSIX | XPG4 | Extension | Subsystem
abort | <stdlib.h> <process.h> | X |  | X | X |  |
abs | <stdlib.h> | X |  | X | X |  | X
access | <io.h> |  |  | X | X | X | X
acos | <math.h> | X |  | X | X |  |
_alloca | <stdlib.h> <malloc.h> <builtin.h> |  |  |  |  | X X | X
asctime | <time.h> | X |  | X | X |  |
asin | <math.h> | X |  | X | X |  |
assert | <assert.h> | X |  | X | X |  |
atan | <math.h> | X |  | X | X |  |
atan2 | <math.h> | X |  | X | X |  |
atexit | <stdlib.h> | X |  |  | X |  |
atof | <stdlib.h> | X |  | X | X | X | X
atoi | <stdlib.h> | X |  | X | X |  | X
atol | <stdlib.h> | X |  | X | X |  | X
atoll | <stdlib.h> |  |  |  |  | X | X
_atold | <stdlib.h> |  |  |  |  | X |

IBM C/C++ Compilers Functions and Macros