Can someone help with this prime code?

[blindleaf]

I have an error with this code and i'm not sure whats wrong with it here's the errors:

primes.c: In function `main':
primes.c:19: parse error before `;'
primes.c: At top level:
primes.c:26: parse error before `}'

here's the actual code:

/*  Ryan Perrott
    CMSC 104 0201
    Lab 7
    11/21/02
    Due: 11/24/02
    Description: This program uses a function to determine if the number is
                 prime and then prints out all the prime numbers between 1-10000.
*/

#include <stdio.h>
#include <math.h>

int prime( int ); /* function prototype */

int main()
{
    int x;

    for(x=1; x<=10000; x++;)
      {
          if( prime( x ) == 1;
          {
              printf( "%d\n", x );
          }
      }
}

int prime( int n )
{
    int a_prime;
    int i;
    float high;

    a_prime = 1;
    if ((n%2)==0)
      {
         a_prime = 0;
      }
    high = sqrt((float) n);
    for (i=3; i<=high; i=i+2)
      {
        if ((n%i)==0)
          {
              a_prime = 0;
          }
      }
    return a_prime;

}

any help would be appreciated thanks!

[Magos]

Maybe it's my eyes, but something seems to be missing...

Originally posted by blindleaf

int main()
{
    int x;

    for(x=1; x<=10000; x++;) <--
      {
          if( prime( x ) == 1; <--
          {
              printf( "%d\n", x );
          }
      }
}

[blindleaf]

ok i got rid of the ";" after the "x++" and i've added another ")" to finish off the if statement, but now i'm getting this error:

/tmp/ccoKCW7q.o: In function `prime':
/tmp/ccoKCW7q.o(.text+0x81): undefined reference to `sqrt'
collect2: ld returned 1 exit status

whats wrong with it now?

here's the code:

#include <stdio.h>
#include <math.h>

int prime( int ); /* function prototype */

int main()
{
    int x;

    for(x=1; x<=10000; x++)
      {
          if( prime( x ) == 1);
          {
              printf( "%d\n", x );
          }
      }
}

int prime( int n )
{
    int a_prime;
    int i;
    float high;

    a_prime = 1;
    if ((n%2)==0)
      {
         a_prime = 0;
      }
    high = sqrt((float) n);
    for (i=3; i<=high; i=i+2)
      {
        if ((n%i)==0)
          {
              a_prime = 0;
          }
      }
    return a_prime;

}

[blindleaf]

ok it compiled now but can someone help me with the logic? The ouput is every number 2-10000 i only want the primes i thought thats what i wrote the program to do, but its not doing that. Do i have some sort of syntax errror? please someone help me.

[orbitz]

if( prime( x ) == 1); <---

[blindleaf]

thank you, i'm an idiot