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Hello everyone I am new here on the forums so first of all hi to everyone :-h .
I am making a infix calculator and the only problem that i am having is handling the parenthesis . The expression without parenthesis is solved correctly but when it comes to an expression with parenthesis i get exception.
PROBLEM SOLVED , THANKS FOR THE REPLIES :)
Please post the full text of the error message.Quote:
i get exception
This is the exception message
Quote:
Exception in thread "main" java.lang.NullPointerException
at d8.apply(d8.java:178)
at d8.eVal(d8.java:146)
at d8.main(d8.java:241)
The error message says the code is trying to use a variable with a null value at line 178.
Look at line 178, see which variable is null and backtrack in the code to find out why that variable does not have a valid value and change the code so it gets a valid value.