/in/foo.c:1:1: warning: data definition has no type or storage class
 r1 = float(input())
 ^~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'r1' [-Wimplicit-int]
/in/foo.c:1:6: error: expected expression before 'float'
 r1 = float(input())
      ^~~~~