A little C++ help for a newb...(formatting output)

[Amber]

Hi,

I am wondering if there is a way (I'm sure there is) to display the following correctly:

I have a user enter a two digit number, say 01, 02,...45...


int id = 0;

cout << "Please enter #: ";
cin >> id;

cout << "#: " << id << endl;

If the number is 01 through 09 it only displays 1-9 without the preceding 0.

I've scoured my book that I have and used google a bit and I can't seem to find an answer.

Anyone know how to correct this?

Thanks from a c++ newb. 🙂

 

[screw3d]

There is a way:

if (id<10)
cout <<"#: 0" <<id <<endl;
else
cout <<"#: " <<id <<endl;

This is not exactly the best way but it works 😛

I think there is a fill() function that can be used in conjunction setw() but I am no expert.

Try this link

 

[Ligoc]

A similar way of doing it would be with the conditional operator.

(condition ? expression1 : expression2)

cout << "#:" << (id < 10 ? "0" : "") << id << endl;

If id is less than 10 it will print out a 0 and if it's greater than or equal to 10 it will print nothing.

edit: clarification

 

[screw3d]

Originally posted by: Ligoc
A similar way of doing it would be with the conditional operator.

(condition ? expression1 : expression2)

cout << "#:" << (id < 10 ? "0" : "") << id << endl;

If id is less than 10 it will print out a 0 and if it's greater than or equal to 10 it will print nothing.

edit: clarification

The conditional operator is merely a short of an if-else statement. It works but it looks ugly and it's difficult to understand IMHO.

 

[gregor7777]

Originally posted by: Ligoc
A similar way of doing it would be with the conditional operator.

(condition ? expression1 : expression2)

cout << "#:" << (id < 10 ? "0" : "") << id << endl;

If id is less than 10 it will print out a 0 and if it's greater than or equal to 10 it will print nothing.

edit: clarification

Great, thanks. This is the one I ended up using. It seems like it was the cleanest way to do what I wanted.

I appreciate everyone's help! 🙂

(used Amber's SN)

 

[onelin]

I love the ? operator.