C++ atof()
Converts String to Double
C++ bsearch()
performs binary search on sorted array
C++ calloc()
allocates block of memory and initializes to zero
C++ cstdlib abs()
Returns absolute value of an integer
C++ div()
computes integral quotient and remainder of number
C++ free()
deallocates a block of memory
C++ getenv()
returns pointer to environment variable passed
C++ labs()
returns absolute value of long or long int number
C++ malloc()
Allocates a block of unitialized memory
C++ qsort()
sorts array using quick-sort algorithm
C++ realloc()
reallocates a block of previously allocated memory
C++ srand()
Seeds pseudo random number for rand()
C++ strtol()
Converts a string to number
C++ strtoull()
converts string to unsigned long long int