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noobish some-questions (first day learning c++)

This is a discussion on noobish some-questions (first day learning c++) within the C++ Programming forums, part of the General Programming Boards category; 1: Code: cout << setiosflags(ios::fixed)<<1000000000000.0 << endl; if we skip setiosflags(ios::fixed) what will it happen 2: does Code: ValueSum += ...

  1. #1
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    noobish some-questions (first day learning c++)

    1:
    Code:
    cout << setiosflags(ios::fixed)<<1000000000000.0 << endl;
    if we skip setiosflags(ios::fixed) what will it happen

    2: does
    Code:
    ValueSum += Value;
    means
    Code:
    ValueSum=ValueSum+Value
    3:[/code]void PrintChar(char c = '=', int n = 80)[/code]

    if we call the above function from main with these 4 options what will happen
    Code:
    PrintChar('*', 20); PrintChar('-'); PrintChar(); PrintChar(20);
    4: whats the different when we externally declare variables and how can we change them from different locations

    5: i cannot understand about the new option i think it somehow bind memory blocks? is it an array or something? when do we have to unbind it? if we dont what will it happen

    6: im unable to understand what substr is and how can we use it, also i cannot understand what getline() is

    thanks in advance

  2. #2
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by cable
    if we skip setiosflags(ios::fixed) what will it happen
    Try it and find out for yourself

    Quote Originally Posted by cable
    2: does
    Code:
    ValueSum += Value;
    means
    Code:
    ValueSum=ValueSum+Value
    Once we add a semi-colon to the latter, yes, but note that due to operator overloading, what an operator normally means is not necessarily what it means.

    Quote Originally Posted by cable
    3:
    Code:
    void PrintChar(char c = '=', int n = 80)
    if we call the above function from main with these 4 options what will happen
    Try them and find out for yourself

    Quote Originally Posted by cable
    4: whats the different when we externally declare variables and how can we change them from different locations

    5: i cannot understand about the new option i think it somehow bind memory blocks? is it an array or something? when do we have to unbind it? if we dont what will it happen

    6: im unable to understand what substr is and how can we use it, also i cannot understand what getline() is
    What prompted you to ask all these questions at one go? Perhaps you should be working through some structured material, e.g., a book or a tutorial.
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    do you recommend me any good c++ tutorial?
    i have found one but it wasn't good enough

  4. #4
    C++ Witch laserlight's Avatar
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    I recommend the book Accelerated C++.
    Elysia likes this.
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  5. #5
    spurious conceit MK27's Avatar
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    Quote Originally Posted by cable View Post
    do you recommend me any good c++ tutorial?
    i have found one but it wasn't good enough
    This one seems okay:

    C++ Language Tutorial - C++ Documentation

    It's clear, up to date, well organized and covers a lot of material.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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