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C++ <cstdlib>
The C++ <cstdlib> header file declares a set of general-purpose functions such as: atof() to convert string to double. It also contains a few mathematical functions. For example, abs() to find the absolute value of a number.
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