I need to convert an int variable to double

Question

My friend is trying to make some kind of calculation as a task for class  and he s having some trouble    I hope you can help him   The problem is that he gets an input from the user as int  it has to be  it s a part of the task   He is trying to convert it to double in the code below  but this doesn t work  The results are int anyway   double firstSolution     b1   a22 - b2   a12     a11   a22 - a12   a21    double secondSolution     b2   a11 - b1   a21     a11   a22 - a12   a21      If you need more explanation  I ll ask him for it  Thanks in advance

User · Accepted Answer

You have to cast one  or both  of the arguments to the division operator to double   double firstSolution    b1   a22 - b2   a12     double  a11   a22 - a12   a21     Since you are performing the same calculation twice I d recommend refactoring your code   double determinant   a11   a22 - a12   a21  double firstSolution    b1   a22 - b2   a12    determinant  double secondSolution    b2   a11 - b1   a21    determinant    This works in the same way  but now there is an implicit cast to double  This conversion from int to double is an example of a widening primitive conversion

User · Answer

Either use casting as others have already said  or multiply one of the int variables by 1 0   double firstSolution     1 0  b1   a22 - b2   a12     a11   a22 - a12   a21

User · Answer

I think you should casting variable or use Integer class by call out method doubleValue

User · Answer

Converting to double can be done by casting an int to a double   You can convert an int to a double by using this mechnism like so   int i   3     i is 3 double d    double  i     d   3 0   Alternative  using Java s automatic type recognition    double d   1 0   i     d   3 0   Implementing this in your code would be something like   double firstSolution     double  b1   a22 - b2   a12     double  a11   a22 - a12   a21    double secondSolution     double  b2   a11 - b1   a21     double  a11   a22 - a12   a21      Alternatively you can use a hard-parameter of type double  1 0  to have java to the work for you  like so   double firstSolution     1 0    b1   a22 - b2   a12      1 0    a11   a22 - a12   a21     double secondSolution     1 0    b2   a11 - b1   a21      1 0    a11   a22 - a12   a21       Good luck

[java] I need to convert an int variable to double

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