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Thinking in C++
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Reading input

The iostreams classes provide the ability to read input. The object used for standard input is cin (for “console input”). cin normally expects input from the console, but this input can be redirected from other sources. An example of redirection is shown later in this chapter.

The iostreams operator used with cin is >>. This operator waits for the same kind of input as its argument. For example, if you give it an integer argument, it waits for an integer from the console. Here’s an example:

//: C02:Numconv.cpp
// Converts decimal to octal and hex
#include <iostream>
using namespace std;

int main() {
  int number;
  cout << "Enter a decimal number: ";
  cin >> number;
  cout << "value in octal = 0" 
       << oct << number << endl;
  cout << "value in hex = 0x" 
       << hex << number << endl;
} ///:~

This program converts a number typed in by the user into octal and hexadecimal representations.

Thinking in C++
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire