Question

我正在为For循环重做一个类问题，并且不能从跑分中获得总数。我试图使用字符串比较，但这可能是问题所在。作业是：

“Simon Says”是一个记忆游戏，其中“Simon”输出10个字符（R，G，B，Y）的序列，用户必须重复该序列。创建一个for循环，比较从索引0开始的两个字符串。对于每个匹配，将一个点添加到userScore。在不匹配时，使用break语句退出循环。例如：以下模式产生的userScore为4：

simonPattern：RRGBRYYBGY

userPattern：RRGBBRYBGY

import java.util.Scanner;

public class SimonSays {
   public static void main (String [] args) {
      String simonPattern = "";
      String userPattern = "";
      int userScore = 0;
      int i = 0;

      userScore = 0;
      simonPattern = "RRGBRYYBGY";
      userPattern  = "RRGBBRYBGY";

     /* Your solution begins here */

        String ss1 = simonPattern.substring(0, 2);
        String us1 = userPattern.substring(0, 2);

        String ss2 = simonPattern.substring(2, 3);
        String us2 = userPattern.substring(2, 3);

        String ss3 = simonPattern.substring(4, 5);
        String us3 = userPattern.substring(4, 5);

        String ss4 = simonPattern.substring(6, 7);
        String us4 = userPattern.substring(6, 7);

        String ss5 = simonPattern.substring(8, 9);
        String us5 = userPattern.substring(8, 9);

        for (i = 0; i < simonPattern.length(); i++) {
        if (ss1.equals(us1)) {
            userScore = userScore + 1;
        }
        if (ss2.equals(us2)){
            userScore = userScore + 1;
        }
        if (ss3.equals(us3)){
            userScore = userScore + 1;
        }
        if (ss4.equals(us4)){
            userScore = userScore + 1;
        }
        if (ss5.equals(us5)){
            userScore = userScore + 1;
        }
        else{
           break;
        }

    }

      /* ^ Your solution goes here ^ */

      System.out.println("userScore: " + userScore);

      return;
   }
}

Answer 1

您的for循环更改public static string RenderView(this Controller controller, string viewName, object model, HttpContext currentContext) { return RenderView(controller, viewName, new ViewDataDictionary(model), currentContext); } public static string RenderView(this Controller controller, string viewName, ViewDataDictionary viewData, HttpContext currentContext) { var routeData = new RouteData(); routeData.Values.Add("Controller", "ASPXTest"); //must match your Controller name routeData.Values.Add("Action", "Test"); //must match your Action name HttpContextWrapper wrapper = new HttpContextWrapper(currentContext); controller.ControllerContext = new ControllerContext(wrapper, routeData, controller); var viewResult = ViewEngines.Engines.FindView(controller.ControllerContext, viewName, null); StringWriter stringWriter; viewData = new ViewDataDictionary(); using (stringWriter = new StringWriter()) { var viewContext = new ViewContext( controller.ControllerContext, viewResult.View, viewData, controller.ControllerContext.Controller.TempData, stringWriter); viewResult.View.Render(viewContext, stringWriter); viewResult.ViewEngine.ReleaseView(controller.ControllerContext, viewResult.View); } return stringWriter.ToString(); }到if (ss1 == us1)的问题与else结果相同，因为String是引用类型而不是原始数据类型

原始数据类型包括if (ss1.equals(us1))，int，double，long，float，byte，short，{ {1}}并且所有对象都是引用类型

boolean

Answer 2

您正确地将循环更改为迭代simonPattern的长度。现在你只需要抛弃循环中的代码并实际使用迭代器变量i。

要从字符串中提取单个字符，您可以继续使用substring(i, i+1)获取String值，但对于单个字符，最好使用charAt(i)。

另外，要将变量增加1，最好使用userScore++而不是userScore = userScore + 1，尽管这也有效。

这意味着您的代码应为：

String simonPattern = "RRGBRYYBGY";
String userPattern  = "RRGBBRYBGY";
int userScore = 0;
for (int i = 0; i < simonPattern.length(); i++) {
    char c1 = simonPattern.charAt(i);
    char c2 = userPattern.charAt(i);
    if (c1 != c2)
        break;
    userScore++;
}
System.out.println("userScore: " + userScore); // prints 4

Answer 3

您可能希望通过迭代userPattern来考虑这样做：

int userScore = 0;

String simonPattern = "RRGBRYYBGY";
String userPattern  = "RRGBBYYBGY";
for (int i = 0; i < userPattern.length(); i++) {
    String p = userPattern.substring(0, 1 + i);
    if (simonPattern.startsWith(p)) {
        userScore = userScore + 1;
    }
}
if (userScore < simonPattern.length()) {
    System.out.println("You got " + userScore + " letters deep out of " + 
            simonPattern.length() + " before you made a mistake.");
}
else { 
    System.out.println("YOU WIN!"); 
}

对于循环和字符串比较

3 个答案: