What are fast input output methods in C?

So the fastest way in c/c++ is :directly read the stream in the raw form, and extract the information required. Also put the output in raw form in a huge buffer and display it finally using fwrite. Some clarification is needed to answer your question.

How do we take input in C?

How to take input and output of basic types in C?

1. Integer: Input: scanf(“\%d”, &intVariable); Output: printf(“\%d”, intVariable);
2. Float: Input: scanf(“\%f”, &floatVariable); Output: printf(“\%f”, floatVariable);
3. Character: Input: scanf(“\%c”, &charVariable); Output: printf(“\%c”, charVariable);

Which is faster CIN or scanf?

and cin becomes faster than scanf() as it should have been. With synchronization turned off, the above results indicate that cin is 8-10\% faster than scanf(). This is probably because scanf() interprets the format arguments at runtime and makes use of variable number of arguments, whereas cin does this at compile time.

What is Getchar_unlocked?

The getchar_unlocked() function is a thread-unsafe version of getchar(). You can use it safely only when the invoking thread has locked stdin using flockfile() (or ftrylockfile()) and funlockfile().

How do you take fast input?

It is often recommended to use scanf/printf instead of cin/cout for fast input and output. However, you can still use cin/cout and achieve the same speed as scanf/printf by including the following two lines in your main() function: ios_base::sync_with_stdio(false);

Which is faster printf or cout?

For int and char* printing std::cout is faster than printf. So again, std::cout should be preferred over printf unless the output is of type double.

What does \%d mean in C?

In C programming language, \%d and \%i are format specifiers as where \%d specifies the type of variable as decimal and \%i specifies the type as integer.

How slow is scanf?

On a floating point test MinGW version of scanf is ~1.9x times slower while printf is ~1.6x times faster. Unfortunately, it is very hard to improve scanf.

Is Getchar faster than scanf?

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.

What is Getchar function in C?

getchar is a function in C programming language that reads a single character from the standard input stream stdin, regardless of what it is, and returns it to the program. It is specified in ANSI-C and is the most basic input function in C. It is included in the stdio. h header file.