Thread: Newbie Question

  1. #1
    Registered User
    Join Date
    Apr 2005

    Newbie Question

    my assignment is to write a program that asks for a temperature in celcius, then spits out a value in fahrenheit, kelvin and reaumur.

    This is what i have done:

    #include <stdio.h>
    #include <stdlib.h>
    int main()
        float Temp;
        float Fahr, Kelvin, Reamur;
        printf(" Celcius >> ");
        scanf("%f", &Temp);
        Fahr = (Temp * 9/5) + 32;
        Reamur = Temp * 0.8;
        Kelvin = Temp + 273 ;
        printf("\n Fahrenheit >> %f\n", Fahr);
        printf("\n Reamur >> %f\n", Reamur);
        printf("\n Kelvin >> %f\n", Kelvin);
        return 0;
    Now the lecture want me to rewrite the code using either " ?: ". i'm not sure how this ?: actually works. Could someone please explain to me ??

    Thx in advanced

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Well you would have needed to use if / else to make sense of using ?:

    if ( a < b ) x = 1; else x = 2;
    x = a < b ? 1 : 2;
    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
    The superhaterodyne twomers's Avatar
    Join Date
    Dec 2005
    ?: is OK for small conditions, IMO, but NEVER nest it! It's the most ugly thing to dubug!!

  4. #4
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    It's not any harder to debug than an if-else ladder. Just use whitespace like you would with with your if-else tree. Your code is only as ugly as you make it.

    Hope is the first step on the road to disappointment.

  5. #5
    Registered User
    Join Date
    Apr 2005
    ic . many thanks guys. understood very well now

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