Neede Help With PRIME1

[devashishlodh]

So m getting a runtime eroor ...
can ayone help me what am i doing wrong????
http://ideone.com/m2k9e6

[leppyr64]

Please post your code inline using code tags.

[devashishlodh]

here it is :

int main()
{
int i,j,k,ctr,m,n,ch;
scanf("%d",&ch);
for(i=1;i<=ch;i++)
{
scanf("%d%d",&m,&n);
for(j=m+1;j<n;j++)
{
ctr=0;
for(k=2;k<=j/2;j++)
{
if(j%k==0)
{
ctr=1;
break;
}
}
if(ctr==0)
printf("%d\n",j);
}
printf("\n");
}
return 0;
}

[leppyr64]

for(k=2;k<=j/2;j++)