The "c" in cout refers to "character" and "out" means "output". Hence cout means "character output". The cout object is used along with the insertion operator << in order to display a stream of characters.
cin is an object of the input stream and is used to take input from input streams like files, console, etc. cout is an object of the output stream that is used to show output. Basically, cin is an input statement while cout is an output statement. They also use different operators.
cin and cout are streams and do not exist in C. You can use printf() and scanf() in C.
In this case, the subject " cout " means "the standard character output device", and the verb " << " means "output the object" — in other words, the command " cout << " means "send to the standard output stream," (in this case we assume the default, the console).
C++ std:cout: A namespace is a declarative region inside which something is defined. So, in that case, cout is defined in the std namespace. Thus, std::cout states that is cout defined in the std namespace otherwise to use the definition of cout which is defined in std namespace.
std::cout is an object of class ostream that represents the standard output stream oriented to narrow characters (of type char). It corresponds to the C stream stdout.
cout is a output stream while printf is a function. cout is used only by c++ while printf can be used by both c and c++. cout example : cout<<”Message”; while printf example : printf(“%d”,sum); cout doesn't require format specifier while c does require.
They're bitwise shift operators ( << is shift left, >> is shift right). They're also commonly overloaded as streaming operators ( << then means stream out, >> stream in) — with stream type on the left side (e.g. std::ostream or std::istream ) and any other type on the right side.
A statement to print the value of a variable or a string of characters (set of characters enclosed by double quotes) to the screen begins with cout, followed by the insertion operator, («) which is created by typing the ``less than'' character (<) twice. The data to be printed follows the insertion operator.
std::cout handles all types for you, while printf requires specific syntax depending on an integer type (there are non-integer types, but the only non-integer type you will use in practice with printf is const char * (C string, can be obtained using to_c method of std::string )).
To answer your question, printf is faster.
cout is an output statement in c++ programming language while print is just a statement used when writing pseudocodes for and it becomes an output statement in C when it is written as printf. both tasks is same but difference is cout is used in c++ n print is used in c .
Tl;Dr: Both functions do the same thing but use a different backend I/O. scanf is from a previous form of c and causes more work if you change a variable type later. cin doesn't require the variable type to be added to the call to avoid this issue. scanf is typically faster than cin due to syncing.
Example 1: C Output
The printf() is a library function to send formatted output to the screen. The function prints the string inside quotations. To use printf() in our program, we need to include stdio.h header file using the #include <stdio.h> statement.
cout is an instance of the class std::ostream , and yes, it's a global variable.
Cout is used with the insertion operator, which is written as << (two “less than” signs). The actual output then follows, written within quotation marks. The line must end with a semicolon. Become familiar with other uses of cout.
Bitwise Right shift operator >> is used to shift the binary sequence to right side by specified position.
In programming (Java, C, C++, JavaScript etc.), the increment operator ++ increases the value of a variable by 1. Similarly, the decrement operator -- decreases the value of a variable by 1.
C++ manipulator endl function is used to insert a new line character and flush the stream. Working of endl manipulator is similar to '\n' character in C++. It prints the output of the following statement in the next line.
Std::cout is the preferred way to print a string in C++.
cout is an instance of a class called ostream. cout is not a function. You could say cout is a variable.
"printf" is the name of one of the main C output functions, and stands for "print formatted". printf format strings are complementary to scanf format strings, which provide formatted input (lexing aka. parsing).
cout does not have a return value. cout is an object of type ostream .