Nested Loop

[za777ef]

Hi guys,

how can i write a program look like this
enter a number > than 1
1
wrong input
enter a number > than 1
11
prime number
press any key...........

enter a number > than 1
18
18 = 2 * 9
18 = 3 * 6
18 = 6 *3
18 = 9 * 2
press any key...........

this my work but it didn't work as it required

#include <stdio.h>
#include <stdlib.h>
int main(){
int num,i,o,j,k=50;
 
do{
   printf ("Enter end values>\n");
   scanf("%d",&num);
   if (num<=1 )
   printf("wrong in put\n"); break;
   }
   while (num>1); 
          for (i = 2; i<num; i++)
          {
          if ((num % i) == 0)
          {
          o=1;
          break;
          }
          }
          if (o==2)
          printf("prime number\n");
          else
          for (i=num; i<=num; i++) {
          printf("The divisors of %d are \n",i);
          for (j=2; j<=k;  j++) {
          if(i%j==0) 
          printf("%d\n",j); 
          }  
          }
   system ("pause");
   return 0; 
   }

[newb16]

Do you understand how your work works? What prevents you from making it work as required?

[za777ef]

yes,of course i know how it work.
but i don't know how i can make it work as it required.
i know how to find the divisors of a number like 18
i can make the program show the divisors of a number
like
2
3
6
9
18

but how i can make the program show it me like that
18 = 2 * 9
18 = 3 * 6
18 = 6 *3
18 = 9 * 2

[Banfa]

Are you sure about the knowing how it works because your loop round lines 6 to 12 of your listing never runs more than once because of the break on line 10. It does not ensure a correct input value and it passes whatever value it is given onto the rest of the code.

Also you claim to be able to do the complex things like finding the divisors of a number but not the simple things like printing the result??

If X is a divisor of Y then

printf("%d = %d * %d\n", Y, X, Y/X);

should do it.

[za777ef]

think you every one
you helped me alot

but stil there is somthing wrong with the do-while
if i put 1 the program show
wrong input
prime number

the same problem if i write any number below 1
how can i make it stop at wrong input if i write any number below 1

[jkmyoung]

I think you want continue as opposed to break?

--edit Actually, just take out the break completely, like suggested earlier.

[za777ef]

Guys if I remove the break on line 10
the program will not work

the only problem is when I write 1 or less
it prints
wrong input
prime number

I want it to prints only ((( wrong input )))

please guys help me how I can solve this problem . . .

[newb16]

Dump the 'beak' and change loop condition to (num<=1) sothat it loops until correct number is entered.

[za777ef]

Thanks every one. . .

The program is know working as I want.