Removing a decimal point in java

Question

I am wanting to store an integer named Amount, I want it to be stored in pence so if the user entered 11.45 it would be stored as 1145. What is the best way to remove the decimal point? Should I be using decimalFormatting in Java?

Edit:

It is entered in string format, was going to covert it to an int. I will give one of your solutions ago and let you know if it works but not sure which one would be the best.. Thanks everyone.

Answer 1

times it by 100 and cast as int. Use decimal formatting is double / float are too inaccurate which they may be for money

Answer 2

If the user input is in the form of a string (and the format has been verified), then you can strip out the decimal point and interpret the result as an integer (or leave it as a string without the decimal point).

String input = "11.45";
String stripped = input.replace(".", ""); // becomes "1145"
int value = Integer.parseInt(stripped);

If it's a float already, then just multiply by 100 and cast, as @user1281385 suggests.

Answer 3

Tested and works . Even if the user enters a number without a decimal, it will keep it as such.

double x = 11.45; // number inputted

String s = String.valueOf(x); // String value of the number inputted
int index = s.indexOf("."); // find where the decimal is located

int amount = (int)x; // intialize it to be the number inputted, in case its an int

if (amount != x) // if the number inputted isn't an int (contains decimal)
    // multiply it by 10 ^ (the number of digits after the decimal place)
    amount = (int)(x * Math.pow(10,(s.length() - 1 - index)));

System.out.print(amount); // output is 1145

// if x was 11.4500, the output is 1145 as well
// if x was 114500, the output is 114500

Answer 4

What about convert to float, multiply by 100 and then convert to int?

String pound = "10.45"; // user-entered string
int pence = (int)Math.round(Float.parseFloat(pound) * 100);

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