Multiplying TextBox to a Value

Question

Possible Duplicate:
C#, Operator ‘*’ cannot be applied to operands of type ‘double’ and ‘decimal’

Hi i want to Multiply the value that inserted in the textbox but i getting error. Here's my Code.

decimal num1, num2;
if(decimal.TryParse(textBox1.Text, out num1) 
   && decimal.TryParse(textBox2.Text, out num2)){

 decimal ans = num1 * 0.20 + num2 * 0.20;
 Label1.Text = ans.ToString();

        }else{
            MessageBox.Show("Please Put a number!! ");
        }

I'm having error in "ans" please help me. This my error "Operator * cannot be applied to operands of type 'decimal' and double;"

Operator * cannot be applied to operands of type 'decimal' and double; — Jay, Nov 11 '12 at 10:14
Then, this is a duplicate of [http://stackoverflow.com/questions/363706/c-operator-cannot-be-applied-to-operands-of-type-double-and-decimal](http://stackoverflow.com/questions/363706/c-operator-cannot-be-applied-to-operands-of-type-double-and-decimal) — Zbigniew, Nov 11 '12 at 10:16

score 3 · Answer 1 · edited May 23 '17 at 12:04

3

The problem is that the compiler sees the constants as Double.
To fix the error itself you can either cast the constants to decimal like this:

decimal ans = num1 * (decimal)0.20 + num2 * (decimal)0.20;

Or even better (as stated in the comments) you can just specify the type of the constants

decimal ans = num1 * 0.20m + num2 * 0.20m;

edited May 23 '17 at 12:04

Community

1
1

answered Nov 11 '12 at 10:16

Blachshma

17,097
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Why casting constants instead of [making them of the right type](http://stackoverflow.com/a/166762/11683) in the first place? It may even [be harmful](http://stackoverflow.com/questions/166752/c-sharp-compiler-number-literals/166762#comment6475244_166809). – GSerg Nov 11 '12 at 10:19
GSerg is right, no casting needed. Look what Hamlet Hakobyan wrote – CSharpie Nov 11 '12 at 10:27

score 2 · Answer 2 · answered Nov 11 '12 at 10:19

2

decimal ans = num1 * 0.20m + num2 * 0.20m;

answered Nov 11 '12 at 10:19

Hamlet Hakobyan

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Multiplying TextBox to a Value

2 Answers2