Input from keybaord Java to C++
This shows how to read values that the user types at the keyboard. Note that for most of these methods, nothing will be received until after the user presses <enter>. This allows the user to backspace and retype mistakes before sending the input to the program.

Java

C++



*Something.java[2] means the file "Something.java" at line 2.

Importing

In Java, the easiest way to access input from the keyboard is through the Scanner class. This is imported at Main.java[1]. Similarly in C++ we include the <iostream> file at Main.cpp[1]. Don't forget the namespace at Main.cpp[3].

Input source

In Java we get input from the keyboard via System.in. We connect this to a scanner as shown at Main.java[5]. In C++ this is simpler. We access keyboard input from the variable cin, which was declared inside of <iostream>. We don't need anything like Scanner in C++.

Reading input

To read in an integer in Java we used the nextInt() method shown at Main.java[9]. To do the same thing in C++ we use the >> operator as shown at Main.cpp[9]. We can read double values in a similar way as shown at Main.java[11] and Main.cpp[11].

Reading strings is special. In both languages, reading a string simply reads until the first space or the end of line is found. This will read in single words at a time. In Java we can read the first name followed by the last name as shown in Main.java[18-19]. We can do a similar thing in C++ as shown at Main.cpp[19].