View Compilation Error

0_0_18768181_8515.cpp: In function 'void run()':
0_0_18768181_8515.cpp:146:27: error: 'id' was not declared in this scope
     for(int i=0;i<var;i++)id[i]=i;
                           ^
0_0_18768181_8515.cpp:172:37: error: 'id' was not declared in this scope
             printf("%.6f",(double)x[id[i]]);
                                     ^