Variable Question?

[seth23]

I have a variable A in my program that is equal to -2. I want it to be if the user types A it will subtract 2 from another variable.

Like.

6(B variable)A *6 -2 = 4* B = 4.

But I only want it to be on user input. Is this an if statement or something else?

[Caprico]

Umm, didn't get you... be a little more specific.. Please explain again what you want... Maybe like a sample output of your program...

[seth23]

int var1;
signed int A = -2
cin >> var1; 

If the user inputs the letter A along with their input of var1 it will automatically subtract 2 from var1.

[Caprico]

So basically, suppose I entered 4A, the result would be 2? If that's what you want, this would involve strings...

[seth23]

You are correct. Really? Even though the variables in question are integers? How so?

[Mats]

Because you want them to put in character and numeral input in one go, you are probably best using a string. You will need to test if the string contains A and then extract the numbert, ignoring any invalid inputs.

http://www.cplusplus.com/reference/string/string/

You could otherwise get them to do two inputs and avoid strings:

int var1;
char c = 'x';
cin >> var1; 
cin >> c; 
if(c == 'A')
{
    var1 = var1 - 2;
}

Up to you.