How to you loop this?

1
12
123
1234
12345
1234
123
12
1

or

1
12
123
1234
12345
123456
1234567
123456789


can some1 found me some example so i can have some idea..

I did the first example using two for loops. However it come out
123454321 and not

1
2
3
4
5
4
3
2
1 but you can just format that.

Code:

---

#include <iostream>
#include <conio.h> // for getch

using namespace std;

int main ()
{
    int i;

    for (i = 1; i<= 5; i++) // loop to get 12345
    {
    cout <<i;
    }
    for (i = 4; i>=1; i--) // loop to get 4321
    {
    cout <<i;
    }
    getch(); //ignore this for my compiler
    return 0;
}

---

IM just not exactly sure how to get 1
12
123
But this is a start i guess

Aznmask,

Run a search on creating triangles. Your question is nearly as common as the "clear the screen" question. ;)

-Skipper

Here a small example using printf:

Code:

---

#include <string.h>

int main(void)
{
  int i;
  char msg[] = "12345";
  int l = strlen(msg);

  for(i = 1; i < l; i++) printf("%.*s\n", i, msg);
  for(i = l; i > 0; i--) printf("%.*s\n", i, msg);
  return 0;
}

---

hmm.. i know how to get the first half of the first problem

Code:

---

for (a = 2; a < 7; a++)
  {
    for (x = 1; x < a; x++)
      {
        cout << x;
      }
    cout << endl;
  }

---

i know there is a way to write the entire problem 1 in nested loops.. i just did it not but a week ago.. but it seems to have fled my brain.. bummer...

this set of code produces the following output

Code:

---

1
12
123
1234
12345

---

Quote:

---

Originally posted by Monster
Here a small example using printf:

Code:

---

#include <string.h>

int main(void)
{
  int i;
  char msg[] = "12345";
  int l = strlen(msg);

  for(i = 1; i < l; i++) printf("%.*s\n", i, msg);
  for(i = l; i > 0; i--) printf("%.*s\n", i, msg);
  return 0;
}

---

---

THANK-YOU for everyone's reply...

Hey Monster my teacher never teach us printf. Is there other command that is equal to printf? I think printf is Java's command but we learning C++

printf() is valid in C as well as C++. (here is no cout in C.) Check out sprintf() too.

PLEASE HELP I'm not asking your guys to do my work. BUt atleast give me some hint some instruction to do those while loops

thz

Quote:

---

Originally posted by Aznmask
PLEASE HELP I'm not asking your guys to do my work. BUt atleast give me some hint some instruction to do those while loops

thz

---

Here is an example of the while

while (statement) // if this is true perform statement_1 if false skip it
{
statement_1;
}

i hope this helped
cj
;)