This header file replaces header file Ĭontains function prototypes for C-style string-processing functions. Ĭontains function prototypes for functions that test characters for certain properties (such as whether the character is a digit or a punctuation), and function prototypes for functions that can be used to convert lowercase letters to uppercase letters and vice versa. Ĭontains function prototypes and types for manipulating the time and date. Ĭontains function prototypes for conversions of numbers to text, text to numbers, memory allocation, random numbers and various other utility functions. Ĭontains function prototypes for math library functions. Ĭontains function prototypes for stream manipulators that format streams of data. h are 'old-style' header files that have been superseded by the C++ Standard Library header files.Ĭontains function prototypes for the C++ standard input and standard output functions. The C++ Standard Library functions are provided as part of the C++ programming environment. This makes the programmer's job easier, because these functions provide many of the capabilities programmers need.

The C++ Standard Library provides a rich collection of functions for performing common mathematical calculations, string manipulations, character manipulations, input/output, error checking and many other useful operations.

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