CODEWITHSUNDEEP
c++charbytecin
Isaac Hili
Isaac Hili

Reputation: 129

C++ - Getting Byte from Console

I am new to C++ and coming from a C# / Java background I feel like I am kind of spoilt.

What I am trying to achieve here is to get the data input by the user as byte (unsigned char) using cin.

#include <iostream>

using namespace std;

typedef unsigned char byte;

int main()
{
    byte num = 0;
    char exitKey = '0';

    cout << "Type in a number between 0 and 255.\n";
    cin >> num;

    cout << "\nYour number multiplied by 2 is:\n" << (num * 2);
    cin >> exitKey;

    return 0;
}

Example

The value returned is the ASCII decimal value of the character I typed in. How can I get the actual value, treating the value as a number?

Help is appreciated. Thanks.

Upvotes: 0

Views: 1400

Answers (2)

Some programmer dude
Some programmer dude

Reputation: 409176

It doesn't matter what type-aliases you use, when reading using cin >> a character is always a character, and will be read as a character.

The value you are getting is the ASCII code for the character '1'.

If you want to read it as a number, then use a proper numeric datatype, like int.

Upvotes: 3

Sumeet
Sumeet

Reputation: 779

Since you are using char datatype here. The 1 value entered here is considered as character and ASCII value of 1 (49) is getting stored and 49 * 2 = 98 is getting printed. Instead of char use int as datatype.

Upvotes: 2

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