Please help

I m new to Codechef....but i m not able to get even one successful submition.....my code is working fine ,in IDE i m using..but here it shows some or the other error..... even for the question (section:PRACTICE/EASY last question) :Life, the Universe, and Everything why this code is not working..?c++(gcc-4.3.2) #include<iostream> using namespace std; int main() { int num; do { cin>>num; if(num==42) break; else cout<<num; }while(1); return 0; }