Question

like “1+23”

parse to double for example.. then calculate..

but when i have a decimal the program crashes for example “1.1+2” the program glitches on the 1.1 when i’m parsing it

 if(s.contains("+"))

    {
        int n = s.indexOf("+");




        String w1 = s.substring(0,n);

        String w2 = s.substring(n+1,s.length());

        part1= (long) Double.parseDouble(w1);
        part2 = (long)Double.parseDouble(w2);

Exception in thread “AWT-EventQueue-0” java.lang.NumberFormatException: For input string: “1.1”
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)

Answer 1

why are you casting from a double to long? that will result in your number being truncated. in the case of 1.1 you will get 1. What you should do is use the following:

Float.parseFloat(w1);

where w1 is your floating point value.

you cannot have part1 be a long value, since long values cannot hold floating points. part1 must be a float.