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mauricio
Asked: 2020-04-23 13:17:16 +0800 CST 2020-04-23 13:17:16 +0800 CST

How to convert a data type double to int?

  • 772

I want to multiply these values.

int result,quantity = 10;
double quantity_col = 3.500;
result = quantity*quantity_col;

but the eclipse ide underlines it and gives me an error.

java.lang.Error cannot convert from double to int

java

3 Answers

  1. Best Answer

    The variable resultis of type int, so, since there is a doublein your multiplication, Eclipse does well to indicate the error, because in a multiplication between a intand a double, the result obtained is a doubleand, as such, it must be stored in a variable of that kind. So your code should look like this:

    int quantity = 10;
double result;
double quantity_col;
result = quantity * quantity_col;

    PS: always declare one attribute per line, for a better reading of the program.

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  2.  double result,quantity = 10;
    double quantity_col = 3.500;
    result = quantity*quantity_col;
    • 2

  3. To convert a value of type double to int you have to use what is known as casting or classes that Java provides to perform conversions. In your case, the code should look like this:

    result = Integer.parseInt(quantity*quantity_col);

    Another option is to cast:

    result = (int) quantity*quantity_col;

    And these are the two ways you can convert a double to an int.

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