/in/foo.cc: In function 'int main()':
/in/foo.cc:9:16: error: 'setpresion' was not declared in this scope
   cout<<fixed<<setpresion<<(4)<<a*9/5+32;
                ^~~~~~~~~~
/in/foo.cc:7:9: warning: unused variable 'b' [-Wunused-variable]
   float b=0;
         ^