View Compilation Error

0_0_30014248_7185.cpp: In function 'int main()':
0_0_30014248_7185.cpp:109:67: error: 'now' was not declared in this scope
         e1=ee=0;prime(sqr=(int)sqrt(n+0.5));printf("%d\n",clock()-now);Pre();
                                                                   ^