I know I can use cin >>as a condition. But I can't understand its functioning because it is unlike typical condition expressions like a a < b.
Why it can works as a condition ?
Asked
Active
Viewed 107 times
0
tsrrhhh
- 409
- 1
- 5
- 10
-
`std::iostream::operator>>` returns a value. Values can be used in conditions. – jamesdlin Mar 27 '17 at 09:13
-
To be more precise: Values that are convertible to boolean can be used in conditions. – eerorika Mar 27 '17 at 09:16
1 Answers
2
cin >> a return cin. When you put in in the if, the operator bool of istream is called, which return cin.good(). Look at The documentation of ios::operator bool.
This is the same as if((bool)(cin >> a)) or if((cin >> a).good()).
