foo.cc: In function 'int main()':
foo.cc:11:3: error: case label ''+'' not within a switch statement
   case'+':
   ^~~~
foo.cc:13:4: error: break statement not within loop or switch
    break;
    ^~~~~
foo.cc:14:3: error: case label ''-'' not within a switch statement
   case'-':
   ^~~~
foo.cc:16:4: error: break statement not within loop or switch
    break;
    ^~~~~
foo.cc:17:3: error: case label ''*'' not within a switch statement
   case'*':
   ^~~~
foo.cc:19:4: error: break statement not within loop or switch
    break;
    ^~~~~
foo.cc:20:3: error: case label ''/'' not within a switch statement
   case'/':
   ^~~~
foo.cc:22:4: error: break statement not within loop or switch
    break;   
    ^~~~~
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%f,%f,%c",&a,&b,&c);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~

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