/in/foo.cc: In function 'int main()':
/in/foo.cc:10:18: warning: unused variable 'c' [-Wunused-variable]
   10 |            float c=(a/20-m)*k;
      |                  ^
/in/foo.cc:11:22: error: 'setprecision' was not declared in this scope
   11 |         cout<<fixed<<setprecision(2)<<c<<endl;
      |                      ^~~~~~~~~~~~
/in/foo.cc:11:39: error: 'c' was not declared in this scope
   11 |         cout<<fixed<<setprecision(2)<<c<<endl;
      |                                       ^
/in/foo.cc: At global scope:
/in/foo.cc:47:1: error: expected declaration before '}' token
   47 | }
      | ^