Pset1 credit card problem: Problem with if statement while classifying into Amex/Visa/Mastercard

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While classifying, I could see MasterCard being correctly spotted but not Visa (not checked yet Amex).

 

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 //check for American Express
    if ((firsttwodigits == 34 || firsttwodigits == 37) && (i == 15))
    {
        printf("Amex");

    }
    //check for MasterCard
    if (i == 16 && (firsttwodigits / 10 == 5) && (firsttwodigits % 10 == 1 || firsttwodigits % 10 == 2 || firsttwodigits % 10 == 3 ||
            firsttwodigits % 10 == 4 || firsttwodigits % 10 == 5))
    {
            printf("MasterCard");

    }
    //check for Visa
    if ((i == 16) && (firsttwodigits % 10 == 4))
    {
        printf("Visa");
    }



			

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https://edstem.org/us/courses/176/discussion/708180?comment=1644439[learn_press_profile]

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