Need study help : /

This is a discussion on Need study help : / within the C++ Programming forums, part of the General Programming Boards category; Some of the questions on our study guide are really vauge and im not sure how to answer them. I ...

  1. #1
    RoD
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    Need study help : /

    Some of the questions on our study guide are really vauge and im not sure how to answer them. I dont want answers, jus a nudge in the right directions.

    6) Are there segments of code that must be defined above all others? yes of course...but thats alot of things If so, which ones? umm...yea...

    23) Explain the empty for loop (; :

    Gee if she ever taught that i might be able too.....

    24) Name the parts of a C++ program:

    Want a book?

    56) Explain why and when to use a continue statement:

    Wow, i dont think she payed attention in class cuz she never taught that one either

  2. #2
    Wen Resu
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    For first, whats first thing you define in a program.
    for second repost with diabled smillies
    Third i duno

  3. #3
    RoD
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    1) typically pre-processor directives

    2) Explain the empty for loop (; :)

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    Registered User major_small's Avatar
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    >typically pre-processor directives

    well, when you #include<iostream>, you're defining cout (along with alot of other things), so Iamien is still right...
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    Crazy Fool Perspective's Avatar
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    > Are there segments of code that must be defined above all others?

    what happens if you define a function after main without a prototype?

    >Explain why and when to use a continue statement

    your in a loop that does stuff. at some iteration you realize "crap, i dont want to do stuff this iteration" using 'continue' basically jumps to the bottom of the loop, skipping the code. the loop then moves on to its next iteration. did that make sense? heres an example

    Code:
    for(int i = 0; i < MAX; i++)
    {
          if( (i % 2) == 0 )
              continue;
    
          cout << i << ", ";
    }
    output:

    1, 3, 5, 7, ...

  6. #6
    RoD
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    Originally posted by major_small
    >typically pre-processor directives

    well, when you #include<iostream>, you're defining cout (along with alot of other things), so Iamien is still right...
    umm its the same thing. I said pre-processor directives, header files ARE PP-directives...and they arent' always the first thing. Pragma comments sometimes come first, for example.

    Thanks perspective.

  7. #7
    Unregistered Leeman_s's Avatar
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    have you really never used a continue statement? i thought someone like you would have already....

    its just where you skip to the end of a loop

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    RoD
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    no, to be dead honest i had never even heard of it till the other day, i guess i just missed it? Thanks for the info guys.

  9. #9
    Registered User major_small's Avatar
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    Originally posted by RoD
    umm its the same thing. I said pre-processor directives, header files ARE PP-directives...and they arent' always the first thing. Pragma comments sometimes come first, for example.

    Thanks perspective.
    that's exactly what I said... try reading the post...


    question: how far can break; and continue; go? do they just go to the nearest loop? or do they go one level up... i.e. if they're in a nested IF, do they stop the IF containing the IF they're in?
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    empty for loop is basically to have a controlled infinitive loop...

    for the parts of a c++ program, how advanced is this class? by the looks of it, its pretty basic, so i'd just go with function prototypes, main, and function declarations
    Last edited by Jamsan; 05-29-2003 at 09:17 AM.

  11. #11
    Toaster Zach L.'s Avatar
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    Originally posted by major_small
    question: how far can break; and continue; go? do they just go to the nearest loop? or do they go one level up... i.e. if they're in a nested IF, do they stop the IF containing the IF they're in?
    breaks have to be within a loop or a switch statement, and will immediately terminate the loop, and continues have to be in a loop, where they immediately jump to the bottom of the loop.
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  12. #12
    Registered User major_small's Avatar
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    Originally posted by Zach L.
    breaks have to be within a loop or a switch statement, and will immediately terminate the loop, and continues have to be in a loop, where they immediately jump to the bottom of the loop.
    oh okay... thanks alot... i got confused because of the breaks in the switch statement...
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    Empty for-loop

    I might use an empty for-loop is there is more than one condition that causes an exit ("break") from the loop. Or, when the exit condition needs to be tested in the middle of the loop.

    Or maybe you want to exit the loop (and the function) with a "return"... maybe multiple returns depending on various conditions.

    Actually, when I want an infinite loop... I think I've used while(1) or do-while(1)

  14. #14
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    ok here is how i answered some questions, and a few new ones, test is tommorow before i go before the board:

    >>Name the parts of a C++ program

    Pre-processor directives, prototypes, data types, classes. functions,array's, sorts, etc

    >>Explain the empty for loop

    The counter is declared and initialized outside of the loop condition but referenced in conditional statements within the loop.

    int i = 0;

    for (; i < 5; i++)
    {
    ....
    }


    New Question:

    98) List the data types and number of bytes each:

    I have NO idea what the bytes are, but i listed char, int, double, float, bool, and string cuz we did those.

    New Question:

    101) Show code line to associate a txt file to outfile variable using append attribute:

    Ok i get this much:

    ofstream outfile;
    outfile.open("c:\\blah.txt");

    but whats the append attribute? Append is add to something right?

    Thanks guys i owe you....

  15. #15
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    Originally posted by RoD
    >>Explain the empty for loop

    The counter is declared and initialized outside of the loop condition but referenced in conditional statements within the loop.

    int i = 0;

    for (; i < 5; i++)
    {
    ....
    }


    New Question:

    98) List the data types and number of bytes each:

    I have NO idea what the bytes are, but i listed char, int, double, float, bool, and string cuz we did those.

    New Question:

    101) Show code line to associate a txt file to outfile variable using append attribute:

    Ok i get this much:

    ofstream outfile;
    outfile.open("c:\\blah.txt");

    but whats the append attribute? Append is add to something right?

    Thanks guys i owe you....
    Empty loops are the same think as infinite loops. This is an example: for(;;)

    99) This is system dependent. Use cout<<sizeof(datatype); where datatype is the datatype you want to find the size of.

    101) Append means that the outputted text is added to the end of the the file. Check out this link.

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