foo.cc: In function 'int main()':
foo.cc:7:27: error: invalid operands of types 'double' and '<unresolved overloaded function type>' to binary 'operator<<'
    7 |  if(a>=2000)  cout<<a*=0.8<<endl;
      |                        ~~~^~~~~~
foo.cc:9:28: error: invalid operands of types 'double' and '<unresolved overloaded function type>' to binary 'operator<<'
    9 |  if(a>=1500)  cout<<a*=0.85<<endl;
      |                        ~~~~^~~~~~
foo.cc:11:29: error: invalid operands of types 'double' and '<unresolved overloaded function type>' to binary 'operator<<'
   11 |    if(a>=1000)  cout<<a*=0.9<<endl;
      |                          ~~~^~~~~~
foo.cc:13:30: error: invalid operands of types 'double' and '<unresolved overloaded function type>' to binary 'operator<<'
   13 |     if(a>=500)  cout<<a*=0.95<<endl;
      |                          ~~~~^~~~~~

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