Do 循环： Do loop.cs





using System;
class Doloop {
public static void Main() {
string myChoice;
do {
// Print A Menu
Console.WriteLine("My Address Book\n");
Console.WriteLine("A - Add New Address");
Console.WriteLine("D - Delete Address");
Console.WriteLine("M - Modify Address");
Console.WriteLine("V - View Addresses");
Console.WriteLine("Q - Quit\n");
Console.WriteLine("Choice (A,D,M,V,or Q): ");

// Retrieve the user's choice
myChoice = Console.ReadLine();
// Make a decision based on the user's choice
switch(myChoice) {
case "A":
case "a":
Console.WriteLine("You wish to add an address.");
break;
case "D":
case "d":
Console.WriteLine("You wish to delete an address.");
break;
case "M":
case "m":
Console.WriteLine("You wish to modify an address.");
break;
case "V":
case "v":
Console.WriteLine("You wish to view the address list.");
break;
case "Q":
case "q":
Console.WriteLine("Bye.");
break;
default:
Console.WriteLine("{0} is not a valid choice", myChoice);
}

// Pause to allow the user to see the results
Console.Write("Press any key to continue...");
Console.ReadLine();
Console.WriteLine();
} while (myChoice != "Q" && myChoice != "q"); // Keep going until the user wants to quit
}
}






为什么编译不能通过呢？

对了，里面的　default   到底是什么意思呀！！！！！！！！！！！！！

default 代表除了所有case的条件以外。

你怎么通不过？错误提示是什么？

using System; class Doloop { public static void Main() { string myChoice; do { // Print A Menu Console.WriteLine("My Address Book\n"); Console.WriteLine("A - Add New Address"); Console.WriteLine("D - Delete Address"); Console.WriteLine("M - Modify Address"); Console.WriteLine("V - View Addresses"); Console.WriteLine("Q - Quit\n"); Console.WriteLine("Choice (A,D,M,V,or Q): ");

// Retrieve the user's choice myChoice = Console.ReadLine(); // Make a decision based on the user's choice switch(myChoice) { case "A": case "a": Console.WriteLine("You wish to add an address."); break; case "D": case "d": Console.WriteLine("You wish to delete an address."); break; case "M": case "m": Console.WriteLine("You wish to modify an address."); break; case "V": case "v": Console.WriteLine("You wish to view the address list."); break; case "Q": case "q": Console.WriteLine("Bye."); break; default: Console.WriteLine("{0} is not a valid choice", myChoice); break; }

// Pause to allow the user to see the results Console.Write("Press any key to continue..."); Console.ReadLine(); Console.WriteLine(); } while (myChoice != "Q" && myChoice != "q"); // Keep going until the user wants to quit } } 你就差这一步,仔细看以下

不用了，因为default已经是最后一个switch了，不用break都会跳出。

nyzfl--这位大哥说的正确呀,我刚实现过了呀.

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