Thread: how to check if an inputted character matches one of a few desired characters.

  1. #1
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    how to check if an inputted character matches one of a few desired characters.

    Hi,

    As part of a project I have to create a calculator that allows the user to input 3 numbers, and two operators from the following: '+', '-', '*' , '/'.
    The inputted operators gets assigned to a char variable (operator1 and operator2). This is done using scanf.

    I want to be able to check that only one of the four operators:  '+' , '-' , '*' and '/'  has been assigned into each char variable and terminate the program if not.

    So if either operator one or two do not contain either '+' , '-' , '*' or '/' the program would be terminated.

    What would be the best way to approach this?
    Any help wold be greatly appreciated thanks.

  2. #2
    and the hat of int overfl Salem's Avatar
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    Maybe
    Code:
    if ( strchr("+-*/",ch) == NULL ) {
       // ch is invalid
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
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    Thank you Salem.

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