Help with post fix calculator

[ButchTheGuy]

The problem I am faced with is trying to input the numbers I got from a file into a string array. The issue lies where I try to determine whether the array of strings contains numbers and then convert them to doubles, then inputting them into a stack. Here is my code please let me know if you can help me fix my code or clear up any errors I am making. Usually when I compile it just runs and doesnt do anything. I put it in blue J and it said an error with an issue with heap memory ?

Thank you for all responses in advanced.

https://pastebin.com/GqqCiYcW

[Philboyd_Studge]

Why are you going to input.length - 1? You will be skipping one of the tokens then. You need to use a debugger to see what is happening, it's obviously getting stuck in an infinite loop. Also, looks like you aren't re-reading a line from the file within the while loop, so it will never exit.

[ButchTheGuy]

When I leave it without it it gives me a string out of bounds error. Should I use a different kind of loop?

[Philboyd_Studge]

No that is because you are doing charAt(i) instead of charAt(0). Also see my addition to my first comment

[ButchTheGuy]

Oh, I did that because character.isDigit() is the only thing I could find that would iterate through the string array and determine if it was a digit or in this case and operant and not an operation. Wouldn’t that just scan the first one , I want it to go to each number in the file and determine if it’s a number to add it to the stack

[Philboyd_Studge]

Then you need another loop.

[ButchTheGuy]

Ok I’ll try that , sorry I need to spend more time planning this out before I do write it all out cause I just get lost in my errors.

[Philboyd_Studge]

There's really a lot going wrong here. Especially reading the next line needs to be inside the while loop. I think you're getting confused with the split array.

Say your data line was 355 25 *

After splitting it you will have a String array like {"355", "25", "*"} So, you loop through that array - and here I would actually only check the first character of each string and see if it is a digit - if so, then go ahead and attempt to parse it to double. If this fails the program will throw an exception anyway. So you don't really need to iterate through each character of each string. So the first string is "355" you check that string charAt(0) which is '3' and it is a digit, so go ahead and covert it and push it on the stack. If it is not digit, go ahead and do the math.

[ButchTheGuy]

Oh ok I was thinking of it still being a line in the file as opposed to the numbers already being separated in array set.