我需要輸入成績列表，并在輸入字符時(shí)讓代碼停止。然后它會(huì)顯示最高等級(jí)和最低等級(jí)。我創(chuàng)建了一個(gè)while loop，但是當(dāng)我運(yùn)行代碼時(shí)，它一直循環(huán)并且不會(huì)停止。public class MaxMinGrades{ public static void main(String[] args){ double maxGrade = Double.MAX_VALUE; double minGrade = Double.MIN_VALUE; Scanner input = new Scanner(System.in); System.out.println("Enter as many student grades as you like. Enter a character to stop."); double grades = input.nextDouble(); while(input.hasNextDouble()) { if (grades > maxGrade) { maxGrade = grades; } if (grades < minGrade) { minGrade = grades; } } System.out.println("The highest grade is: " + maxGrade); System.out.println("The lowest grade is: " + minGrade); }}我會(huì)輸入：50 66.85 73.5 78.9 77q。輸出將是： 最高等級(jí)是：78.9 最低等級(jí)是：50.0
3 回答
楊__羊羊
TA貢獻(xiàn)1943條經(jīng)驗(yàn) 獲得超7個(gè)贊
public class MaxMinGrades{
public static void main(String[] args){
double maxGrade = 0.0;
double minGrade = 100.0;
Scanner input = new Scanner(System.in);
System.out.println("Enter as many student grades as you like. Enter a character to stop.");
while(input.hasNextDouble()) {
double grades = input.nextDouble();
if (grades > maxGrade) {
maxGrade = grades;
}
if (minGrade > grades) {
minGrade = grades;
}
}
System.out.println("The highest grade is: " + maxGrade);
System.out.println("The lowest grade is: " + minGrade);
}
}
這樣， 內(nèi)部就有了中斷條件while loop。當(dāng)某些事情發(fā)生變化時(shí)，boolean就會(huì)檢查條件。
狐的傳說
TA貢獻(xiàn)1804條經(jīng)驗(yàn) 獲得超3個(gè)贊
幾點(diǎn)
1. 一旦獲得第一個(gè)條目，您就需要為 Min 和 Max 分配該值。
2. 變量等級(jí)應(yīng)使用循環(huán)內(nèi)的最新輸入進(jìn)行更新。
public class MaxMinGrades {
public static void main(String[] args){
double maxGrade = Double.MAX_VALUE;
double minGrade = Double.MIN_VALUE;
Scanner input = new Scanner(System.in);
System.out.println("Enter as many student grades as you like. Enter a character to stop.");
double grades = input.nextDouble();
System.out.println("first entry="+grades);
minGrade = maxGrade = grades;
while(input.hasNextDouble()) {
grades = input.nextDouble();
if (grades > maxGrade) {
maxGrade = grades;
}
if (grades < minGrade) {
minGrade = grades;
}
}
System.out.println("The highest grade is: " + maxGrade);
System.out.println("The lowest grade is: " + minGrade);
}
}
侃侃無極
TA貢獻(xiàn)2051條經(jīng)驗(yàn) 獲得超10個(gè)贊
while 循環(huán)中沒有中斷條件。掃描儀將繼續(xù)偵聽輸入。僅當(dāng)輸入非雙字符時(shí)循環(huán)才會(huì)退出。
您實(shí)際上也沒有在每次迭代中獲得下一個(gè)輸入。您需要input.nextDouble()在循環(huán)內(nèi)調(diào)用。
如果你想讓它自己退出，你需要添加一個(gè)中斷條件。例如，您可以在輸入一定數(shù)量后停止，例如：
int gradeCount = 0;
while(input.hasNextDouble() && gradeCount < 6) {
grades = input.nextDouble();
gradeCount += 1;
// your logic here
}
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