Help in for, while and do-while loop

[Synapse]

I really need your help everyone. i need a program that results the output below using for, while, and do-while loop..3 program codes using those 3 loops...please. .i really need your help.

Output:

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10

and also the reverse

10 9 8 7 6 5 4 3 2 1
10 9 8 7 6 5 4 3 2
10 9 8 7 6 5 4 3
10 9 8 7 6 5 4
10 9 8 7 6 5
10 9 8 7 6
10 9 8 7
10 9 8
10 9
10

Great help is really appreciated..th ank you very much.

[horace1]

the simplest way to approach the problem is to attempt to print
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10
using one of the loop constructs.

e.g. the algorithm in pseudo code using a while() would be something like

i=1
while(i < 11)
   j=1
   while (j <= i)
       print j
       j = j + 1
   print '\n'
   i = i + 1

when that works implement the reverse, then the other constructs

[Synapse]

Thank you very much for that quick reply sir..by the way, i used the for loop but then then the output turns out like this..

112123123456123 456712345678123 456789123456789 10 :(

can somebody give me an idea how to break the line...?

here's my code:

#include <iostream.h>
#include <conio.h>

int main (void)

{
int i, j;
for(i=1; i<=10; i++)
for(j=1; j<=i; j++)
cout << j;
return 0;
}

[horace1]

Thank you very much for that quick reply sir..by the way, i used the for loop but then then the output turns out like this..

112123123456123 456712345678123 456789123456789 10 :(

can somebody give me an idea how to break the line...?

}

you forgot to print the newline at the end of the outer loop, e.g.

#include <iostream>
using namespace std;

int main (void)
{
int i, j;
for(i=1; i<=10; i++)
  {
   for(j=1; j<=i; j++)
      cout << j;
   cout << endl;   // ** you needed this!
  }
return 0;
}

avoid using <iostream.h> as it is a deprecated or antiquated header. With modern C++ compilers use <iostream> as above.

[Shakje]

#include <iostream>
using namespace std;

int main (void)
{
int i, j;
for(i=1; i<=10; i++)
  {
   for(j=1; j<=i; j++)
      cout << j;
   cout << endl;   // ** you needed this!
  }
return 0;
}

http://www.devx.com/tips/Tip/14184

If you're doing lots of couts as in this case, it's better to get into the habit of doing cout << "\n" no? :D

[Synapse]

I've already got it before you put the code but that was a great help too.
Now,can you help me with this using the while and do-while loop?
my code isn't working yet.. :(
Thanks for the help guys...

[kashish]

What is the syntax of new operator overloading ?

[Synapse]

#include <iostream>

using namespace std;


when is use this syntax, it says Unable to open include file 'IOSTREAM'

declaration syntax error in using namespace std;

im using Turbo C/C++ Compiler by Borland.

[horace1]

#include <iostream>

using namespace std;


when is use this syntax, it says Unable to open include file 'IOSTREAM'

declaration syntax error in using namespace std;

im using Turbo C/C++ Compiler by Borland.

I assume this is Turbo C V2.0 or V3.0 for DOS - you will need to use the <iostream.h> format as V2.0 and 3.0 are pre the new header files

[horace1]

#include <iostream>
using namespace std;

int main (void)
{
int i, j;
for(i=1; i<=10; i++)
  {
   for(j=1; j<=i; j++)
      cout << j;
   cout << endl;   // ** you needed this!
  }
return 0;
}

http://www.devx.com/tips/Tip/14184

If you're doing lots of couts as in this case, it's better to get into the habit of doing cout << "\n" no? :D

in situations like this I tend to use endl so if the program crashes the streams have been flushed (endl inserts a new-line character into the stream and for buffered streams flushes the buffer). When outputing lots of character based information I tend to put \n in the the strings and an endl on the last one.

[Shakje]

For loops are the best way to do looping when you have a fixed number of iterations, but you can use while loops in the same way quite easily. All a for loop really does is include the stuff you have to do in the line you start it.

while loops keep on executing everything between the braces while the condition in brackets is true. Eg:

int counter = 0;

while(counter < 10)
{
   counter++;
}

This keeps adding 1 to counter until it reaches 10.

This can also be written without the braces:

int counter = 0;

while(counter<10)
  counter++;

A do while works slightly differently, but is the same idea. It's written:

int counter = 0;

do
{
  counter++;
} while(counter<10);

The only real difference is that with a while loop the condition is tested before any code is executed in the loop, whereas the code in a do while loop will execute at least once before the condition is tested.

So in the following example:

while(true)
{
  cout << "LOL";
}

nothing will happen, but if you do the same with a do while:

do
{
  cout << "LOL";
} while(true);

you will get at least one output, because the loop doesn't finish until the very end.

Shouldn't be too difficult to modify the above ;)

[Synapse]

weww! that was a nice nifty tutorial..thanx boss. thank you very much. im goin to try the code then.

harigato :)

[Synapse]

#include <stdio.h>
#include <conio.h>

int main(void)

{
clrscr();
int i, j;

for(i=1; i<=10; i++)

{
while (i<=10)
{
putchar(j+'0');
++i;

if (j==10)
j=0;
else
++j;
printf("j");
}
j=1;

}
return 0;
}


that's my while code up there but the input is

123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
and so on.....

the input must be

1
12
123
1234
12345
123456
1234567
12345678
123456789
12345678910

[horace1]

is this what you were trying to do?

#include <stdio.h>
#include <conio.h>

int main(void)

{
clrscr();
int i=0, j;
while (i<=10)
{
 j=0;
 while(j<=i)
   {   
    printf("%d", j);
    j++;
    }
 printf("\n");
i++;
}
return 0;
}

[Synapse]

thanx sir...but im still a little confuse how the while or do-while loop works.
can somebody explain it to me pls...:(