我正在嘗試做這個家庭作業問題，但我在設置它和理解如何開始和完成這些結果時遇到困難。到目前為止，我已經聲明了公式的變量，創建了掃描儀并嘗試編寫公式。這是我到目前為止所擁有的：?//declaring variables? float a_CompletionPercentage, b_YardsPerAttempt, c_TouchdownsPerAttempt, d_InterceptionsPerAttempt;? float PasserRating;? double Completion, Attempts, Touchdowns, Yards, Interceptions;? Scanner in = new Scanner(System.in); //create Scanner Object? //PlayerName input? System.out.print("Enter the full name of the quarterback: "); //prompt asks for player name? String PlayerName = in.nextLine(); //set string PlayerName as user's input? //attempts input? System.out.print("Enter the number of attempts: "); //prompt asks for # of attempts? Attempts = in.nextDouble(); //set variable Attempts as user's input for # of attempts? //completion input? System.out.print("Enter the number of completions: ");?? Completion = in.nextDouble();?? //yards input? System.out.print("Enter the number of yards: ");?? Yards = in.nextDouble();? //touchdowns input? System.out.print("Enter the number of touchdowns: ");?? Touchdowns = in.nextDouble();?? //interceptions input? System.out.print("Enter the number of interceptions: ");?? Interceptions = in.nextDouble();?我不確定我的變量是否已正確聲明并且我的公式不起作用。這些是我應該得到的一些示例輸出：輸出示例 1：輸入四分衛的全名：Jameis Winston輸入嘗試次數：35輸入完成次數：22輸入碼數：345輸入達陣次數：4輸入攔截次數：1Jameis Winston 的傳球者評分為 121.72619047619047但我得到的是 664.58325 而不是 121.72619047619047。
3 回答
胡說叔叔
TA貢獻1804條經驗 獲得超8個贊
你的公式不正確。
這里：
b_YardsPerAttempt = (((float)(Yards/Attempts)- 3f) * 5f);
當您應該乘以 0.25 時，您卻將 (碼數/嘗試次數 - 3) 的結果乘以 5。這就是你的計算出現錯誤的地方。
請記住，您不應以大寫開頭字母命名變量。此外，在計劃使用新變量之前聲明它們也是一個很好的做法。這是一個片段，您可以看看如何寫得更好一些。
Scanner in = new Scanner(System.in);
System.out.print("Enter the full name of the quarterback: ");
String playerName = in.nextLine();
System.out.print("Enter the number of attempts: ");
Double attempts = in.nextDouble();
System.out.print("Enter the number of completions: ");
Double completion = in.nextDouble();
System.out.print("Enter the number of yards: ");
Double yards = in.nextDouble();
System.out.print("Enter the number of touchdowns: ");
Double touchdowns = in.nextDouble();
System.out.print("Enter the number of interceptions: ");
Double interceptions = in.nextDouble();
Double completionPercentage = ((completion / attempts - 0.3) * 5);
Double yardsPerAttempt = (((yards / attempts) - 3) * 0.25);
Double touchdownsPerAttempt = ((touchdowns / attempts) * 20);
Double interceptionsPerAttempt = (2.375 - ((interceptions / attempts) * 25));
Double passerRating = (((completionPercentage + yardsPerAttempt + touchdownsPerAttempt + interceptionsPerAttempt) / 6) * 100);
System.out.println("The passer rating for " + playerName + " is " + passerRating);
希望這可以幫助！
汪汪一只貓
TA貢獻1898條經驗 獲得超8個贊
我在變量及其格式的聲明方面遇到了問題。
我已經修復了代碼，現在如果有人感興趣的話它可以根據需要工作，這是我的最終工作代碼：
?//declaring variables
? double a_CompletionPercentage, b_YardsPerAttempt, c_TouchdownsPerAttempt, d_InterceptionsPerAttempt;
? double PasserRating;
? int Completion, Attempts, Touchdowns, Yards, Interceptions;
? Scanner in = new Scanner(System.in); //create Scanner Object
? //PlayerName input
? System.out.print("Enter the full name of the quarterback: "); //prompt asks for player name
? String PlayerName = in.nextLine(); //set string PlayerName as user's input
? //attempts input
? System.out.print("Enter the number of attempts: "); //prompt asks for # of attempts
? Attempts = in.nextInt(); //set variable Attempts as user's input for # of attempts
? //completion input
? System.out.print("Enter the number of completions: ");?
? Completion = in.nextInt();?
? //yards input
? System.out.print("Enter the number of yards: ");?
? Yards = in.nextInt();
? //touchdowns input
? System.out.print("Enter the number of touchdowns: ");?
? Touchdowns = in.nextInt();?
? //interceptions input
? System.out.print("Enter the number of interceptions: ");?
? Interceptions = in.nextInt();?
? //calculations?
? if (Attempts == 0) {
? ? ? ? System.out.println("The passer rating for " + PlayerName + " is " + 0);
? } else {
? ? ?a_CompletionPercentage = ((double)Completion /Attempts - 0.3) * 5.0; //formula for completion percentage
? ? ?b_YardsPerAttempt =? ? ? ((double)Yards? ? ? /Attempts - 3.0) * 0.25; //formula for yards per attempt
? ? ?c_TouchdownsPerAttempt = ((double)Touchdowns /Attempts)? ? ? ?* 20.0; //formula for touchdowns per attempt
? ? ?d_InterceptionsPerAttempt = 2.375f - ((double)Interceptions /Attempts * 25.0); //formula for interceptions per attempt
? ? ?//formula for passing rate
? ? ?PasserRating = (((a_CompletionPercentage + b_YardsPerAttempt + c_TouchdownsPerAttempt + d_InterceptionsPerAttempt)/6.0) * 100.0);?
? ? ?//Displays result
? ? ?if (PasserRating < 0){
? ? ? ? System.out.println("The passer rating for " + PlayerName + " is " + 0);
? ? ?} else{
? ? ? ? System.out.println("The passer rating for " + PlayerName + " is " + PasserRating);
? ? ?}
? }
炎炎設計
TA貢獻1808條經驗 獲得超4個贊
您沒有遵循變量名稱等的常用 Java 編碼約定。這會使您的代碼可讀性較差。從學習它們開始。
像大多數新手程序員一樣，您將太多精力集中在輸入上，而沒有足夠地編寫正確的函數。
現在學習JUnit還不算太早，?我建議編寫五個函數：
public interface PasserRatingCalculator {
? ? default double calculateCompletionPercentage(int numAttempts, int numCompletions) { return ((double)numCompletions)/numAttempts; }
? ? double calculateYardsPerAttempt(int numAttempts, int numYards) { return ((double)numYards/numAttempts; }
? ? double calculateTouuchdownsPerAttempt(int numAttempts, int numTouchdowns) { return ((double)numTouchdowns)/numAttempts; }
? ? double calculateInterceptionsPerAttempt(int numAttempts, int numInterceptions) { return ((double)numInterceptions)/numAttempts; }
? ? double calculatePasserRating(numAttempts, int numCompletions, int numYards, int numTouchdowns, int numCompletions);? ? ? ??
}
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