Question

What is the diffetence between getchar and getchar_unlock?

Answer 1

Answer:

One more difference with getchar() is, it is not a C standard library function, but a POSIX function. It may not work on Windows based compilers. It is a known fact than scanf() is faster than cin and getchar() is faster than scanf() in general. getchar_unlocked() is faster than getchar(), hence fastest of all.

Answer 2

The difference between getchar and getchar_unlock

• Getchar() is not a C standard library function; rather, it is a POSIX function, which is another distinction. On compilers built on Windows, it might not function. It is well known that getchar() is quicker than scanf() in general and that scanf() is faster than cin. Because getchar unlocked() is quicker than getchar(), it is the fastest function.
• A thread-unsafe version of getchar is getchar unlocked() (). Only when stdin has been locked using flockfile() (or ftrylockfile()) and funlockfile can you use it safely ().
• The header file in the C language contains the getchar function. When the user must input a single character, it is used. The function receives an unsigned char as input; after casting, it either returns an int or an EOF.
• The C function getchar reads a single character from the standard input stream stdin and returns it to the application, independent of its content. It is the most fundamental input function in C and is given in ANSI-C. It is a part of the stdio.
• One of the functions that takes input from the user is getchar(). However, it can only hold one character at a time; if the user enters more than one, it reads only one character.

#SPJ2