Java: Convert scientific notation to regular int

Question

How do I convert scientific notation to regular int For example: 1.23E2 I would like to convert it to 123

Thanks.

Answer 1

You can just cast it to int as:

double d = 1.23E2; // or float d = 1.23E2f;
int i = (int)d; // i is now 123

Answer 2

You can also use something like this.

(int) Double.parseDouble("1.23E2")

Answer 3

Check out DecimalFormat.parse().

Sample code:

DecimalFormat df = new DecimalFormat();
Number num = df.parse("1.23E2", new ParsePosition(0));
int ans = num.intValue();
System.out.println(ans); // This prints 123

Answer 4

You can implement your own solution:

String string = notation.replace(".", "").split("E")[0]

Answer 5

I am assuming you have it as a string.

Take a look at the DecimalFormat class. Most people use it for formatting numbers as strings, but it actually has a parse method to go the other way around! You initialize it with your pattern (see the tutorial), and then invoke parse() on the input string.

Answer 6

If you have your value as a String, you could use

int val = new BigDecimal(stringValue).intValue();