How to divide by tenths if they hit?

Question

Java

Hello, please tell me how to multiply and divide if the number comes across with tenths?

String res = String.valueOf(input1 * porci2 / 100);

and if a number with tenths or hundredths comes across in porci2, then the application crashes ...
Please tell me how to fix it ??

Answer 1

Hello!
I recommend that you seriously study the basics of programming and, in particular, programming in Java. Understand concepts such as dynamic and static typing.
Java is a statically typed language. This means that the type of a variable is declared at the time it is declared. I also recommend reading about such concepts. as explicit and implicit type casting.
Based on the above, the following is not clear:

and if a number with tenths or hundredths comes across in porci2, then the application crashes ...

Where does the number with tenths and hundredths come from in the porci2 or input1 variable?
I suspect that the porci2 and input1 values ​​are some kind of int or long value, and from the outside you are assigning a real number type to these variables. If so, use the type double for these variables and that should solve the problem.