What is the meaning of Stdio H?
Now say printf is a function. When you use it, its code must be written somewhere so that you directly use it. "stdio.h" is a header file, where this and other similar functions are defined. stdio.h stands for standard input output header.
C Programming/stddef.h. From Wikibooks, open books for an open world. < C Programming. stddef.h is a header file in the standard library of the C programming language that defines the macros NULL and offsetof as well as the types ptrdiff_t, wchar_t, and size_t.
- If my compiler is set to 64 bit, size_t is nothing other than a typedef for unsigned long long. So in 32 bits or the common ILP32 (integer, long, pointer) model size_t is 32 bits. and in 64 bits or the common LP64 (long, pointer) model size_t is 64 bits (integers are still 32 bits).
- Unsigned and Signed Integers. An integer is a number with no fractional part; it can be positive, negative or zero. In ordinary usage, one uses a minus sign to designate a negative integer. However, a computer can only store information in bits, which can only have the values zero or one.
- npos is a static member constant value with the greatest possible value for an element of type size_t. This value, when used as the value for a len (or sublen) parameter in string's member functions, means "until the end of the string". As a return value, it is usually used to indicate no matches.
conio.h is a C header file used mostly by MS-DOS compilers to provide console input/output. It is not part of the C standard library or ISO C, nor is it defined by POSIX. This header declares several useful library functions for performing "console input and output" from a program.
- getch() is a way to get a user inputted character. It can be used to hold program execution, but the "holding" is simply a side-effect of its primary purpose, which is to wait until the user enters a character. getch() and getchar() are used to read a character from screen.
- stdio.h - standard C input and output , as printf , scanf , fprintf etc. this API is a C API only and based on stateless functions and structures like FILE which hold the state. conio.h is a C header file used mostly by MS-DOS compilers to provide console input/output.
- conio.h is a header file used in old MS-DOS compilers to create text user interfaces. It is not part of the C programming language, the C standard library, ISO C nor is it required by POSIX. This header declares several useful library functions for performing "console input and output" from a program.
In C programming language time.h (used as ctime in C++) is a header file defined in the C Standard Library that contains time and date function declarations to provide standardized access to time/date manipulation and formatting.
- RAND_MAX. Maximum value returned by rand. This macro expands to an integral constant expression whose value is the maximum value returned by the rand function. This value is library-dependent, but is guaranteed to be at least 32767 on any standard library implementation.
- The rand() function is used in PHP to generate a random integer. The rand() PHP function can also be used to generate a random number within a specific range, such as a number between 10 and 30.
- The isset () function is used to check whether a variable is set or not. If a variable is already unset with unset() function, it will no longer be set. The isset() function return false if testing variable contains a NULL value.
Updated: 2nd October 2019