Undefined reference to main

[umbos]

hi!
why do i get this error??

/usr/lib/gcc/i486-linux-gnu/4.3.2/../../../../lib/crt1.o: In function _start':
/home/aurel32/tmp/glibc/glibc-2.9/csu/../sysdeps/i386/elf/start.S:115: undefined reference tomain'
collect2: ld returned 1 exit status

this is my code:

#include <stdio.h>
int primo (int n);
int main ( int argc, char * argv[])
	{
	int n , l , i ,j ,t,m;
	scanf("%d",&t);
	for ( i = 0 ; i < t ; i++)
		{
		scanf("%d %d",&n,&m);
			for ( j = n ; j <= m ; j++)
				if ( primo(j) == 1)
					printf("%d ",j);
		printf("\n");
		}
	return 0;
	}
int primo (int n)
	{
	int primo ,i;
	if (n <= 1)
		primo = 0;
	else if ( n <= 3)
		primo = 1 ;
	else
		for ( i = 2 , primo = 1; i <= n/2 && primo != 0 ; i++)
			if (n % i == 0)
				primo = 0; 
	return primo;
	}

[leppyr64]

I don't know. What do you do to get that error?

Your code doesn't return that error when compiled and run on ideone.

[bbone=c,327]#include

int primo (int n);

int main ( int argc, char * argv[])
{
int n , l , i ,j ,t,m;

scanf("%d",&t);
for ( i = 0 ; i < t ; i++)
{
scanf("%d %d",&n,&m);
for ( j = n ; j <= m ; j++)
if ( primo(j) == 1)
printf("%d ",j);
printf("\n");
}
return 0;
}

int primo (int n)
{
int primo ,i;

if (n <= 1)
primo = 0;
else if ( n <= 3)
primo = 1 ;
else
for ( i = 2 , primo = 1; i <= n/2 && primo != 0 ; i++)
if (n % i == 0)
primo = 0;

return primo;
}[/bbone]