Raising a number to a power in Java

Question

Here is my code   For some reason my BMI is not calculated correctly  When I check the output on a calculator for this    10   10 100  2    I get 1000  but in my program  I get 5   I m not sure what I am doing wrong   Here is my code   import javax swing     public class BMI       public static void main String args              int height          int weight          String getweight          getweight   JOptionPane showInputDialog null   Please enter your weight in Kilograms            String getheight          getheight   JOptionPane showInputDialog null   Please enter your height in Centimeters            weight   Integer parseInt getweight           height   Integer parseInt getheight           double bmi          bmi    weight   height 100  2            JOptionPane showMessageDialog null   Your BMI is      bmi

User · Answer

1  We usually do not use int data types to height  weight  distance            temperature etc  variables which can have decimal points           Therefore height  weight should be double or float           but double is more accurate than float when you have more decimal points  2  And instead of    you can change that calculation as below using Math pow    bmi    weight  Math pow height 100  2       3  Math pow   method has below definition  Math pow double var 1  double var 2     Example   i  Math pow 8  2  is produced 64   8 to the power 2   ii  Math pow 8 2  2 1  is produced 82 986813689753  8 2 to the power 2 1

User · Answer

Your calculation is likely the culprit  Try using   bmi   weight   Math pow height   100 0  2 0     Because both height and 100 are integers  you were likely getting the wrong answer when dividing  However  100 0 is a double  I suggest you make weight a double as well  Also  the   operator is not for powers  Use the Math pow   method instead

User · Answer

Too late for the OP of course  but still    Rearranging the expression as   int bmi    10000   weight     height   height    Eliminates all the floating point  and converts a division by a constant to a multiplication  which should execute faster  Integer precision is probably adequate for this application  but if it is not then   double bmi    10000 0   weight     height   height    would still be an improvement

User · Answer

is not the operator you want  You are looking for the pow function of java lang Math   You can use Math pow value  power    Example   Math pow 23  5      23 to the fifth power

User · Answer

we can use   Math pow 2  4     this mean 2 to the power 4  2 4   answer   16

User · Answer

in java does not mean to raise to a power  It means XOR   You can use java s Math pow      And you might want to consider using double instead of int   that is   double height  double weight    Note that 199 100 evaluates to 1

User · Answer

int weight 10  int height 10  double bmi  bmi   weight   Math pow height   100 0  2 0   System out println  bmi   bmi    double result   bmi   100  result   Math round result   result   result   100  System out println  result  result

User · Answer

You should use below method-   Math pow double a  double b   Returns the value of the first argument raised to the power of the second argument

[java] Raising a number to a power in Java

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