int get()

[jLNv0pDG]

int get();
Extracts a character from the stream and returns its value (casted to an integer).

#include <iostream>

int main()
{
	std::cout << "Enter a two digit number from 10-99: ";

	// How do I just put numbers in the input stream here?
        // "cin" goes here?

	int a, b;

	a = int get();
	std::cout << "The first number is: " << a << std::endl;

	b = int get();
	std::cout << "The second number is: " << b << std::endl;

	return 0;
}

I want to be able to input a 2 digit integer and return each digit separately. (There are probably other/easier ways to do this but I'd like to try it like this as a learning exercise.)

Am I even using int get() correctly?

[chrisname]

Not quite. Remove the "int" and just type "get()" like you would for any other function call.

I'm not sure though... are you using std::cin.get()?
By the way, when you want to read a few characters from a stream, std::cin is fine. Most people don't recommend it though - it does no typechecking and can easily mess up if you don't use it wisely. For std::strings, use getline(stream, std::string), for single characters, I think you can use std::cin.get(); or this "int get()" (but remove the int when calling it).

[Bazzy]

By the way, when you want to read a few characters from a stream, std::cin is fine. Most people don't recommend it though

Is not std::cin itself which isn't recommended, is the >> operator having cin as left hand operand to not be recommended: http://www.cplusplus.com/forum/articles/6046/

[jLNv0pDG]

@chrisname: "Remove the "int" and just type "get()" -- Yes, in hindsight that seems obvious. ^.^'
Although, I think you almost need to be a c++ expert to understand some of the c++ help documentation!

"are you using std::cin.get()?" -- I was wondering if there was just a plain cin() function that read console input (cin = ConsoleINput?) and just left that input in some sort of buffer/stream/RAM thing which plain get() could then access later on. It appears there is not.

int get();
Extracts a character from the stream and returns its value (casted to an integer).

I made a mistake here. I thought that "returns its value (casted to an integer)" meant, if I input '9' it would return the value 9. Instead it returns the ASCII value of '9' which is 57. So, int a = 57, while I should have been doing char a = 9.


@Bazzy: Thanks for the link.

 // How to get a number.
 int myNumber = 0;

 while (true) {
   cout << "Please enter a valid number: ";
   getline(cin, input);

   // This code converts from string to number safely.
   stringstream myStream(input);
   if (myStream >> myNumber)
     break;
   cout << "Invalid number, please try again" << endl;
 }
 cout << "You entered: " << myNumber << endl << endl;

That seems like a *lot* of effort just to input a number... Do you make a function or something out of it?

int cin_int(void)
{
    std::string input = "";
    int myNumber = 0;

    while (true) {
    getline(std::cin, input);
    std::stringstream myStream(input);
    if (myStream >> myNumber)
        break;
    }
    return myNumber;    
 }