View Compilation Error

0_0_39314439_8728.cpp: In function 'int main()':
0_0_39314439_8728.cpp:8:30: error: 'sqrt' was not declared in this scope
    8 |                 int s=(int)((sqrt(5.0)+1.0)/2.0*fabs(a-b));
      |                              ^~~~
0_0_39314439_8728.cpp:8:49: error: 'fabs' was not declared in this scope; did you mean 'labs'?
    8 |                 int s=(int)((sqrt(5.0)+1.0)/2.0*fabs(a-b));
      |                                                 ^~~~
      |                                                 labs