converting chars to ints

This is a discussion on converting chars to ints within the C++ Programming forums, part of the General Programming Boards category; hello everyone I am making a stack calculator. I have the code for the pop and push functions etc, but ...

  1. #1
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    converting chars to ints

    hello everyone
    I am making a stack calculator. I have the code for the pop and push functions etc, but I have one problem. I need to convert all the numbers in the array to ints(doesnt have to be in the array). I have tried casting, and adding 0 to the number, but all they did was convert the number to the ascii representation. I tried atoi(), but apparently that will not work with one element of an array. Does anybody have any ideas? Thank you

  2. #2
    Skunkmeister Stoned_Coder's Avatar
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    why do you want to do this .... surely better would be to make your stack a template!
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

  3. #3
    Registered User Hoegje's Avatar
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    Indeed, make it a template functions, or maybe even just use the STL with it's container types. I'm sure there will be some sort of stack already available for you, although I am not sure which container to use exactly. It can't be hard to find though.
    Why do some work again, when it has already been done for you ? Be as lazy as possible and use the STL !!

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    actually, i am quite the newbie at programming, and I am trying to learn the basics before any advanced stuff. Can anybody help me?

  5. #5
    Skunkmeister Stoned_Coder's Avatar
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    you need a combination of static_cast<int>(tobecast) and a loop.Loop through your array and cast each element.Depending on what you are casting from it may be necessary to store the new values in a different array.
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

  6. #6
    Registered User ski6ski's Avatar
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    >>I need to convert all the numbers in the array to ints

    Here is the reason why:

    'conversion' : cannot convert from 'type1' to 'type2'

    The compiler was unable to cast from ‘type1’ to ‘type2.’ If you’ve encountered this error on code which compiled with an earlier version of Visual C++, please read Technote: Improved Conformance to ANSI C++ for more information.

    The following example illustrates this error.

    Code:
    int main()
    {
       int *i;
       float j;
       
       j = (float)i; /* cannot cast from
                  pointer to int to float */
    }
    edit: This is from MSDN for MSVC 6.0.
    Last edited by ski6ski; 09-01-2001 at 07:09 AM.
    C++ Is Powerful
    I use C++
    There fore I am Powerful

  7. #7
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    Your casting a pointer to int to float?

    [code]
    int main(void)
    {
    int* i = new int(5);
    float j = *i;

    delete i;

    return 0;
    }

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