[ho_schi]

For C users. And C++ users:

In C++ we can declare variable in the while or if statement:

https://en.cppreference.com/w/cpp/language/while

https://en.cppreference.com/w/cpp/language/if

It's value is the value of the decision. This is not possible with C [1].

Since C++17 the if condition can contain an initializer: Ctrl+F if statements with initializer

https://en.cppreference.com/w/cpp/language/if

Which sounds like the same? Now you can declare a variable and it value is not directly evaluated, you also can compare it in a condition. I think both are neat features of C++, without adding complexity.

[1] Also not possible with Java.

[trelane]

Declaring a variable in a loop or if statement is supported since C99: https://en.wikipedia.org/wiki/C99

Also in Java: https://www.geeksforgeeks.org/for-loop-java-important-points...

[ho_schi]

Regarding Java:

It is possible that you confuse while- and for statements?

[maccard]

No, declaring a variable in a `for` loop is supported in C99 but you can't do if-init.

[ho_schi]

You do :)

My post was about while and if and you repeatingly bring up for. The for statement is another statement.

[trelane]

Ah, you're right (finally tried it out). But it 100% works in a loop (usually for loop)

[maccard]

It’s one of those things that I never knew I wanted until I started using it, and now i miss it when it’s not available.The reason you want it is the same reason you want to declare a variable in the statement of a for loop rather than pre declaring and using a while loop

[trelane]

I've used it in go a lot. If you want to kludge it, you can still put a block around the if. But it's not nearly as nice