C# While Loop

[adman29]

Hey everyone. I've got a quick question about while loops, and can't figure out exactly what's happening. I'm programming in Visual Studio 2017, and need to program a while loop to have a user reenter a response if the original response is not the right data type. I've included a screenshot of what I've got so far, which from everything I've found so far says is correct. 

Now whenever I actually run the cmd program, it'll require me to enter the same thing twice for the program to take it. 

Any ideas?

[JesperEC]

The "do { CODE } while (CONDITION);" loop runs the contents of the loop once first, before checking the condition. To have it check the condition (after "while") the first time around too, use a "while (CONDITION) { CODE }" loop instead. 

[MrDrWho13]

7 minutes ago, JesperEC said:

The "do { CODE } while (CONDITION);" loop runs the contents of the loop once first, before checking the condition. To have it check the condition (after "while") the first time around too, use a "while (CONDITION) { CODE }" loop instead. 

+1 to this. There is a different between a "while" loop and a "do while" loop. The "do while" loop completes the code once before checking the condition, whereas the "while" doesn't.

[adman29]

@MrDrWho13 & @JesperEC

This fixed it! You guys are great. I'm not sure if my programming professor is wrong, or if I'm wrong, but I'll talk it out with her in Office hours.

Again, thanks for your help!

[coolgs10]

@JesperEC and @MrDrWho13 said it. And in addition to that the do while loop is exit control loop and the while loop is entry control loop. Exit control loop check the test condition after executing the body and at the end. Entry control loop checks the test condition at the beginning of the body before entering the body.