Need some help..

Ok i come here to ask for help not for argue. plus i'm not expert on C+ other wise i wont be here.


my high school teacher gave us 20 problem and I'm stuck on this problem

this waht i copy from a black board.


Enter n: 4

6 * 7 = 42
66 * 67 = 4422
666 * 667 = 444222
6666 * 6667 = 44442222


I have to use loop to do it. But this one is so hard i have no idea how to start.

Sorry, I don't think any of us understood you the first time, you probably should have told us in the first place Ok, here's an idea:
to input, use cin:

Code:

int input;
cin >> input; // now input contains whatever the guy typed.

Here's a idea:

Code:

for(int i = 0; i < input; ++i) //execute this loop (input) times
{
    for(int n = 0; n <= i; ++n)
    {
        cout << "6"; //print the 6's
    }
    cout << " * ";
    for(n = 0; n < i; ++n)
    {
        cout << "6"; //print the 1st part of 6666...7
    }
    cout << "7 = "; //print the 7, then " = "
    for(n = 0; n <= i; ++n)
    {
        cout << "4"; //print the 4's
    }
    for(n = 0; n <= i; ++n)
    {
        cout << "2"; //print the 2's
    }
    cout << endl; //new line
}

I just typed this up right now, might not work but it should be enough to get you started (if not finished). I really hope you learn something from this, instead of just copy/pasting like lots of people do.

OH
so let me try to understand this
4 is the number of times you need to multiply in some way (which is what you should have told us back on the addition one)
um, i can give you some basic psuedo code, no real code (cause my head hurts at the moment)

take in a variable
for (int i=0;i<thatVariableYouTookIn;i++)
if (i==0)
{
var1=6
var2=7
}
else
{
//do adding to var1 and var2
//seems to add 60, the 600, then 6000 to both variables
}
}

that's about the best i can do for now



[edit]
what hunter did works great, mine would actually multiply stuff...but i don't think you really need to do that.
By the way your c++ class blows, i think your teacher's a moron
[/edit]

Well, my method just sort of assumes that whatever the teacher said is right. Basically, it just writes out n 6's, *, n-1 6's, 7, =, then n 4's, then n 2's. Don't know if that's what the teacher wanted, but it should work if the pattern continues

the problem is he will check each of the program. other wise everyone jsut Cout everything.


Is this a loop or jsut cout.?

float n;


cout<<"ENTER N:";
cin>>n ;
{
cout<<"\t" <<n/2<<"="<<"\t"<<n/2<<"\t";
}
cout<<"\t"<<n/2<<"+"<<n<<"="<<n+n/2;
{
cout<<"\t"<<n/2<<"+"<<n<<"+"<<n+n/2<<"="<<n+n+n;
}

cout<<"\t"<<n/2<<"+"<<n<<"+"<<n+n/2<<"+"<<n+n

<<"="<<n+n+n+n+n;


{
cout<<endl;
}



out put is
2 = 2
2+4 = 6
2+4+6=12
2+4+6+8=20

Do you have a horrible teacher?

Wow, I guess so... either that or he's bsing. This is a loop:

Code:

for(int i = 0; i < number_of_times_you_want_to_loop; ++i)
{
    whatever_you_want_to_do_in_the_loop();
}

And this is another loop:

Code:

while(whatever_has_to_be_true_for_the_loop_to_keep_going)
{
    whatever_you_want_to_do_in_the_loop();
}

It's a simple concept, but an important one. If your teacher teaches anything in class, LISTEN TO HIM/HER because otherwise you won't have a clue what to do for you homework; in fact, you sound like one of those people who spend their time pulling the keyboard and mouse cables out of people's computers while the teacher is teaching...

>>you sound like one of those people who spend their time pulling the keyboard and mouse cables out of people's computers while the teacher is teaching...

i second that notion