View Compilation Error

0_0_17431940_20640.cpp: In function 'double f(double)':
0_0_17431940_20640.cpp:10:2: error: 'nbsp' was not declared in this scope
     double ret = 0.0, a, b;
  ^
0_0_17431940_20640.cpp: In function 'int main()':
0_0_17431940_20640.cpp:21:2: error: 'nbsp' was not declared in this scope
     int i, T, temp;
  ^