View Compilation Error

0_0_39415602_22438.cpp: In instantiation of 'void read(T&) [with T = int]':
0_0_39415602_22438.cpp:34:8:   required from here
0_0_39415602_22438.cpp:28:13: error: return-statement with a value, in function returning 'void' [-fpermissive]
   28 |    return x * f;
      |           ~~^~~