标准库函数的头文件
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  函数                               头文件
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abort                                stdlib. h
abs                                  stdlib. h
acos                                 math. h
asctime                              time. h
asin                                 math. h
assert                               assert.h
atan                                 math. h
atan2                                math. h
atexit                               stdlib. h
atof                                 stdlib. h
atoi                                 stdlib. h
atol                                 stdlib. h
bsearch                              stdlib. h
BUFSIZ                               stdio. h
calloc                               stdlib. h
ceil                                 math. h
clearerr                             stdio. h
clock                                time. h
CLOCKS-PER-SEC                       time. h
clock_t                              time. h
cos                                  math. h

cosh                                 math. h
ctime                                time. h
difftime                             time. h
div                                  stdlib. h
div_t                                stdlib. h
EDOM                                 errno. h
EOF                                  stdio. h
ERANGE                               errno. h
errno                                errno. h
exit                                 stdlib. h
EXIT_FAILURE                         stdlib. h
EXIT_SUCCESS                         stdlib. h
exp                                  math. h
fabs                                 math. h
fclose                               stdio. h
feof                                 stdio.h
ferror                               stdio.h
fflush                               stdio. h
fgetc                                stdio.h
fgetpos                              stdio. h
fgets                                stdio.h
FILE                                 stdio. h
FILENAME-MAX                        stdio. h
floor                                math. H

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