View Compilation Error

0_0_14689700_12047.cpp: In function 'void work()':
0_0_14689700_12047.cpp:117:21: error: lvalue required as left operand of assignment
         sample[i].X = -sample[i].X;
                     ^
0_0_14689700_12047.cpp:120:23: error: lvalue required as left operand of assignment
         tbSample[i].X = -tbSample[i].X;
                       ^