23. To convert Fahrenheit ( F ) temperatures to Centigrade ( C ) temperatures people use the formula: (32 degrees F is 0 degrees C, 212 degrees F is 100 degrees C, etc.)

double C,F;

```
cin >> F;
C = ( 5 / 9 ) * ( F - 32 );
cout << C;
```

Programmer Pauline noticed a strange problem when she tested the program: the output was always zero no matter what value was for F.

What might fix the problem?

a) C should have been int type

b) The number 32 should have been 32.0

c) The number 9 should have been 9.0

d) F should have been int type

e) 5 / 9 should have been 5 % 9