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abort | stops the program
assert | stops the program if an expression isn't true
atexit | sets a function to be called when the program exits
bsearch | perform a binary search
exit | stop the program
getenv | get enviornment information about a variable
longjmp | start execution at a certain point in the program
qsort | perform a quicksort
raise | send a signal to the program
rand | returns a pseudorandom number
setjmp | set execution to start at a certain point
signal | register a function as a signal handler
srand | initialize the random number generator
system | perform a system call
va_arg | use variable length parameter lists