I want to share in your knowlegde

This is a discussion on I want to share in your knowlegde within the C Programming forums, part of the General Programming Boards category; Ok I have a lot of questions about C and I was hoping that you would help me answer them ...

  1. #1
    Registered User zergdeath1's Avatar
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    Question I want to share in your knowlegde

    Ok I have a lot of questions about C and I was hoping that you would help me answer them I you could would please do so as this is probably cofusing others to thanks:

    1. Why does C have so many ways to input numbers, int, float, double, char, signed, unsigned, etc...

    2. Do i really need to memorize all of them and there related features early in programming?

    3. What is the differance between signed and unsigned? Is it really nessecery?

    4. I do not understand the CHAR funtion at all could you explain it to me? or tell me what use it is i meen it doesnt seem to have a purpose.

    5. Are all of the above things neccessary to know how to program?

    Thanks for Helping me.

    I would also like help understanding octal, hexidecimal #s:

    1. What is the differance?

    2. Can you help me learn how to read and convert to and from them?

    3. Do I need to know them for C?

    4. Any other information about these...?

    5. Do you know of any websites that might help me understand Octal or hexidecimal numbers?

    Please if you can thank you?

  2. #2
    End Of Line Hammer's Avatar
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    Re: I want to share in your knowlegde

    >>1. Why does C have so many ways to input numbers, int, float, double, char, signed, unsigned, etc...
    Because it does. It's useful to be able to store different number types.

    >>2. Do i really need to memorize all of them and there related features early in programming?
    Memorise, probably not. Understand and be aware, yes. With practice, you'll find you remember them all anyway without too much effort.

    >>3. What is the differance between signed and unsigned? Is it really nessecery?
    Difference is that signed ints use a single bit to denote the positive/negative sign. Unsigned ints don't as they're always deemed to be positive. Therefore they are free to use that extra bit in their number storage, which makes them able to store higher numbers than signed ints. Is it necessary, yes.

    >>4. I do not understand the CHAR funtion at all could you explain it to me? or tell me what use it is i meen it doesnt seem to have a purpose.
    There is no "CHAR function". Can you explain your question better.

    >>5. Are all of the above things neccessary to know how to program?
    It depends on what you're programming. You don't use all elements of the language all of the time, but you should be aware of what there is available. Memorising the complete language isn't a requirement, but a conceptual understanding of most of it is, in the long term.

    >>octal, hexidecimal #s
    >>1. What is the differance?
    They are different ways to represent the same number.

    >>2. Can you help me learn how to read and convert to and from them?
    http://www.google.com/search?hl=en&l...ecimal&spell=1
    Google is always good for finding these types of things.

    >>3. Do I need to know them for C?
    It's better to, but not essential, imo. You don't need to know the maths behind converting one to another, that's what calculators are for.

    >>5. Do you know of any websites that might help me understand Octal or hexidecimal numbers?
    www.google.com
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  3. #3
    twm
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    1a) Because there are so many numbers. Next!

    2a) Nope, it comes with time. Most experts have a reference handy at all times too. Next!

    3a) Signed can hold a negative value, unsigned can't. But unsigned can hold larger positive values. Next!

    4a) char is a type, not a function. It's a little integer that is used to represent printable characters. There are little nuances, but you don't need to worry about them until later. Next!

    5a) No. Shell scripting is just saving a bunch of shell commands to a file and making it executable. But shell scripting is considered programming. Next!

    1b) Each one prints out differently. Next!

    2b) It's all binary at the bottom, but you can use printf's formatting flags to change how a value is printed. %o is octal, %x is hexadecimal, and %d is decimal. No, there's no flag for binary. Next!

    3b) Not at first, but later on it couldn't hurt. Next!

    4b) www.google.com

    5b) www.google.com
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  4. #4
    Senior Member joshdick's Avatar
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    For the programming you're going to do early on, you're only really going to use int and double. If it's an integer, use int. If it's a number that you want to be able to hold decimal values, use double.

    The rest is basically just size differences. The reserved words short and long are just what they say they are. Unless you're working with really big numbers or are under some serious size constraints, that isn't really essential for you. I suggest that you now focus on learning other concepts like loops, arrays, pointers, classes, etc.
    FAQ

    "The computer programmer is a creator of universes for which he alone is responsible. Universes of virtually unlimited complexity can be created in the form of computer programs." -- Joseph Weizenbaum.

    "If you cannot grok the overall structure of a program while taking a shower, you are not ready to code it." -- Richard Pattis.

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