Solved

# Having Trouble with Nested Loops

Posted on 2001-06-21
290 Views
Can anyone help me? I'm totally lost.

I'm trying to write a nested loop code segment that produces the following ouput:

1
1 2
1 2 3
1 2 3 4

0
Question by:Michelle21221
• 4
• 3
• 2
• +2

Accepted Solution

johnbrewer1980 earned 25 total points
easy:
for (int i = 1; i <= 4; ++i) {
for (int j = 1; j <= i; ++j) {
cout << j;
}
cout << endl;
}
0

LVL 7

Expert Comment

Looks a bit like homework. We can (may) not provide complete solutions to homework, but we can assist you.

Is there any code you've tried or written so far? Even when it's not working (yet), we can help you to get it right.
0

LVL 1

Expert Comment

for (int i = 1; i <= 4; ++i) {
for (int j = 1; j <= i; ++j) {
cout << j << " ";
}
cout << endl;
}

cout<<endl<<"Thanks for you help."<<endl
0

Expert Comment

Hey glesby, that's the same as my answer!
0

LVL 1

Expert Comment

I'd like to acknowledge johnbrewer1980, whose answer was highly influential in helping to construct this answer.
0

LVL 49

Expert Comment

#include "stdafx.h"
#include <iostream.h>

void OutputIt( int n ) {
if ( n != 0 ) {
OutputIt(n-1);
cout << n << ' ';
}
}

int main(int argc, char* argv[])
{
OutputIt( 1 ); cout << endl;
OutputIt( 2 ); cout << endl;
OutputIt( 3 ); cout << endl;
OutputIt( 4 ); cout << endl;
return( 0 );
}

Thank you, thank you!  I'd like to thank all of the little people who contributed, however insignificantly to this production.  You LIKE me! you REALLY LIKE Me!

-- Dan
0

LVL 9

Expert Comment

#include "stdafx.h"

#include <string>
#include <iostream>

using namespace std;

int main(int argc, char* argv[])
{
std::string szString;
for (int n=1;n<=4;n++)
{
char szBuffer[32];
itoa(n,szBuffer,10);
szString+=szBuffer;
cout << szString <<endl;
szString += " ";
}
return 0;
}

my contribution to this party :) - this was all my own work and I will thank no one except the great almighty - whomever that might be
0

LVL 49

Expert Comment

I've improved my algorithm:

#include "stdafx.h"
#include <iostream.h>

int main(int argc, char* argv[])
cout << "Nested loop example:" << endl;
cout << "1" << endl;
cout << "1 2" << endl;
cout << "1 2 3" << endl;
cout << "1 2 3 4" << endl;
}

Simpler is always better.  Just be sure to keep the first line or the professor won't know how hard you worked.

-- Dan

0

LVL 9

Expert Comment

Dan - I hate to tell you this but - YOU made a mistake :)

is that your first mistake this century ?
0

LVL 49

Expert Comment

Just seeing if YOU were paying attention. Ha! made ya look! :---}

-- Dan
0

LVL 7

Expert Comment

// Okay, you asked for it...

#include <iostream>

template<int N>
struct print_numbers
{
ostream& print(ostream& out) const
{
print_numbers<N-1>().print(out);
out << " " << N;
return out;
}
};

template<>
struct print_numbers<1>
{
ostream& print(ostream& out) const
{
out << 1;
return out;
}
};

template<int K>
struct print_lines
{
ostream& print(ostream& out) const
{
print_lines<K-1>().print(out);
print_numbers<K>().print(out);
out << endl;
return out;
}
};

template<>
struct print_lines<1>
{
ostream& print(ostream& out) const
{
print_numbers<1>().print(out);
out << endl;
return out;
}
};

int main()
{
print_lines<4>().print(cout);
}
0

LVL 49

Expert Comment

Michelle21221,
Ignore KangRoo's post.  It is one thing to bring a polished apple to the teacher.  It's quite another to backup a truck full of them to the classroom door...

-- Dan
0

LVL 9

Expert Comment

I'd fail it due to lack of comments myself
0

## Featured Post

Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.