×
INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

how to read an array of 10 numbers and print the prime numbers?

how to read an array of 10 numbers and print the prime numbers?

how to read an array of 10 numbers and print the prime numbers?

(OP)
this is what i wrote
could someone tell me where is my mistake?
can i use here flag at all?

#include <stdio.h>

void main ()
{
int arr[10], i, j, flag;

for (i=0;i<10;i++)

scanf ("%d", &arr[i]);

for (i=0;i<10;i++)
{
flag=1;


for (j=2;j<=(arr[i]/2); j++)
{
if (arr[i]%j==0)
{
flag=0;
break;

}
}
}

for (i=0;i<10;i++)
{
if (flag=1)

printf ("%d", arr[i]);
}
}

RE: how to read an array of 10 numbers and print the prime numbers?

Hi

Use equality check instead of setting value :

CODE

if (flag==1)
Then is a conceptual mistake : you use a single variable to hold the status of all checked numbers. Of course, if the last checked one was prime, will say all were.

Either make the flag an array

CODE

#include <stdio.h>

int main ()
{
  int arr[10], i, j, flag[10];

  for (i=0;i<10;i++) scanf("%d", &arr[i]);

  for (i=0;i<10;i++) {
    flag[i]=1;

    for (j=2;j<=(arr[i]/2); j++) {
      if (arr[i]%j==0) {
        flag[i]=0;
        break;
      }
    }
  }

  for (i=0;i<10;i++) {
    if (flag[i]) printf("%d", arr[i]);
  }
}
or print the results before ending the second outer loop.

CODE

#include <stdio.h>

int main ()
{
  int arr[10], i, j, flag;

  for (i=0;i<10;i++) scanf("%d", &arr[i]);

  for (i=0;i<10;i++) {
    flag=1;

    for (j=2;j<=(arr[i]/2); j++) {
      if (arr[i]%j==0) {
        flag=0;
        break;
      }
    }
    if (flag) printf("%d", arr[i]);
  }
}

Feherke.
http://rootshell.be/~feherke/

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close