View Compilation Error

0_0_37560481_977.cpp: In function 'int main()':
0_0_37560481_977.cpp:178:2: error: 'startTime' was not declared in this scope
  startTime = clock();
  ^
0_0_37560481_977.cpp:178:20: error: 'clock' was not declared in this scope
  startTime = clock();
                    ^