Making An Output Display Twice What the Input Was

How do you multiply/modify a variable so that the value it displays is twice what the user entered?

I am asking the user to input an age and I want the output to show an age that is two times what the user entered. Can anyone please help?

[John D'Errico]

What have you tried? If you want help, then show what you have done.

But surely, you can multiply a number by 2?

[Image Analyst]

Sure, we can help. Read this first: http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers After that, if you follow what it says, we'll know how to help you.

In the meantime, check out the input() function.

[Ava Beaugrand]

This is what I have done so far.

[Ava Beaugrand]

I am very new to MATLAB, but my attempt to multiply the age variable can be seen within the fprintf() function on the last line. My result when I did this though gave "bp" instead of a number twice the input number value like I wanted.

[Ava Beaugrand]

The prompt I was given said , " This can be done by multiplying the age variable and storing it back into the same variable, or by multiplying the age variable when using it in the fprintf() statement. " but I do not know how to go about doing this.

Answer 1

[Rik]

You need to make sure you receive the input as a numeric data type, or you need to convert the string input to a double (that is a hint about which function you should be using). Currently you're multiplying the separate characters in the char array, so ['2'*2 '0'*2].