foo.cc: In function 'int main()':
foo.cc:5:7: error: expected initializer before '<=' token
  int a<=20,b;
       ^~
foo.cc:6:7: error: 'a' was not declared in this scope
  cin>>a>>endl;
       ^
foo.cc:7:11: error: 'b' was not declared in this scope
  if(a<=2) b=a*10.5;
           ^
foo.cc:8:7: error: 'b' was not declared in this scope
  else b=2*10.5+(a-2)*4;
       ^
foo.cc:9:8: error: 'b' was not declared in this scope
  cout<<b<<endl;
        ^

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