Commonly used old - style header files.

Header File	Contents and Purpose	New Version
<assert.h>	Contains macros and information for adding diagnostics that aid program debugging.	<cassert>
<ctype.h>	Contains function prototypes for functions that test characters for certain properties, and functions prototypes for functions that can be used to convert lowercase letters to uppercase letters and vice versa.	<cctype>
<float.h>	Contains the floating-point size limits of the system.	<cfloat>
<limits.h>	Contains the integral size limits of the system.	<climits>
<math.h>	Contains function prototypes for math library functions.	<cmath>
<stdio.h>	Contains function prototypes for the standard input /output library functions and informations used by them.	<cstdio>
<stdlib.h>	Contains function prototypes for conversion of numbers to text, text to numbers, memory alocation, random numbers, and various other utility functions.	<cstdlib>
<string.h>	Contains function prototypes for C-style string processing functions.	<cstring>
<time.h>	Contains function prototypes and types for manipulating the time and date.
<iostream.h>	Contains function prototypes for the standard input and standard output functions.	<iostream>
<iomanip.h>	Contains function prototypes for the stream manipulators that enable formatting of streams of data.	<iomanip>
<fstream.h>	Contains function prototypes for functions that perform input from file on disk and output to files on disk.	<fstream>