Thread: 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

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

1) typically pre-processor directives

2) Explain the empty for loop (; :)

> 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, ...

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.

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

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.

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)

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....

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.