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Still need to know how to make a calculator

IndrekSntIndrekSnt Member Posts: 69
[b][red]This message was edited by IndrekSnt at 2003-4-30 5:24:48[/red][/b][hr]
[b][red]This message was edited by IndrekSnt at 2003-4-30 5:22:57[/red][/b][hr]
I wanted to make a calculator which loads a string from a textbox. And when i click on a button called "calculate" then it calculates all the stuff that is in the textbox(like a scientific calculator does). I tried a simplier way but it gave me wrong answers. What should i code to make such calculator? :'( Please help me! Thanks for any help




Comments

  • CHRIS_swdevCHRIS_swdev Member Posts: 16
    I had to make one in Java before in some data structures class
    I don't know if it is the best way but it works

    First you have to make 2 stacks
    one is an operator stack and the other is an Number stack

    Obviously your operators are '(','+', and so on
    so read your string in from the text area

    now push your first number on the Number stack
    push your operator on the operator stack
    push your next number on the number stack
    now compare the next operator with the top one on the stack
    if the operator on the stack has a greater precedence
    pop the 2 numbers off and pop the opeator now do the calculation... then push the answer on the number stack

    if the operator on the stack has a lower precedence then push the operator on the operator stack and continue with the algorithm until = has been reached .... = has the lowest precedence

    It has been a couple of years since I did this I believe its close to what you want. If you need further help hit me up.

    ~Chris




  • IndrekSntIndrekSnt Member Posts: 69
    : I had to make one in Java before in some data structures class
    : I don't know if it is the best way but it works
    :
    : First you have to make 2 stacks
    : one is an operator stack and the other is an Number stack
    :
    : Obviously your operators are '(','+', and so on
    : so read your string in from the text area
    :
    : now push your first number on the Number stack
    : push your operator on the operator stack
    : push your next number on the number stack
    : now compare the next operator with the top one on the stack
    : if the operator on the stack has a greater precedence
    : pop the 2 numbers off and pop the opeator now do the calculation... then push the answer on the number stack
    :
    : if the operator on the stack has a lower precedence then push the operator on the operator stack and continue with the algorithm until = has been reached .... = has the lowest precedence
    :
    : It has been a couple of years since I did this I believe its close to what you want. If you need further help hit me up.
    :
    : ~Chris
    :
    :
    :
    :
    Yes, this really is what i wanted, thanks!
    Now the only thing that matters me is that i must get the characters and numbers separately. Maybe that will be something long and hard to understand...
  • CHRIS_swdevCHRIS_swdev Member Posts: 16
    : Yes, this really is what i wanted, thanks!
    : Now the only thing that matters me is that i must get the characters and numbers separately. Maybe that will be something long and hard to understand...
    :

    I am confused on what you mean by getting the characters and numbers separately....
  • IndrekSntIndrekSnt Member Posts: 69
    : : Yes, this really is what i wanted, thanks!
    : : Now the only thing that matters me is that i must get the characters and numbers separately. Maybe that will be something long and hard to understand...
    : :
    :
    : I am confused on what you mean by getting the characters and numbers separately....
    :
    It doesn't matter anymore, i made the calculator successful in a little easier way. It works great and thanks to everyone who helped me!
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