What does it mean and how can you fix it.

Question

Error: Operator '-' cannot be applied to operands of type 'string' and 'string'

Answer 1

int age1 = 18;
int age2 = 15;
int output = age1 - age2;
Console.WriteLine(output);
//gives 3

Answer 2

I wanted to subtract someone else's age from mine

Answer 3

Make age type int.

int age;

Then you can substract the value of age and also prevent the age to be "very old"

(Please notic your title is not very descriptive and you have a good question. Make you title like "Why do I get error : you cannot use the subtraction operator on two string operands").

Answer 4

K thnx
I'm just a beginner it's gonna take a while to get used to this.

Answer 5

Ash, you need to use integer values and not string values. Therefore, you would do something like this.

int myAge = 18;
int friendsAge = 17;
int ageDifference;

ageDifference = myAge - friendsAge;

or

ageDifference = 18 - 17;

If you're using number literals, then you need to remove the quotes from around them.

Answer 6

Your are welcome. It is a good question. Keep asking.

Answer 7

What do you want to do ?

Answer 8

I want to subtract 2 string values

Answer 9

Ash, you cannot use the subtraction operator on two string operands. You can concatenate two strings together using the '+' operator, but that's it.

Answer 10

Is it a string or a value

like ""cat"
or a value "2"

C# won't recognise "2" as a value
"1" + "2" = 12
"cat" + "and" + "dog" = cat and dog

"1" - "2" = //makes no sense

Answer 11

I want the other person to type in their age
so i used

string YourAge;
Console.WriteLine("How old are you");

YourAge = Console.ReadLine();

now I wanted to use that age to subtract from mine

Answer 12

int YourAge;
Console.WriteLine("How old are you");
YourAge = Convert.ToInt32(Console.ReadLine()); .

Answer 13

thnx a lot