我需要让程序循环直到文件末尾。每次循环运行时,它都应该捕获学生的姓名和测试分数。当程序发现“-1”时,程序应该知道它已达到学生分数的末尾。然后应该找到他们的平均分和字母等级。最后,程序应该打印出一个文件,其中包含整个类(class)的摘要。
我已经让它为第一个学生工作,但现在我需要让它工作到文件末尾。我知道这可能不是最有效的方法,但这是我能想到的唯一方法。
public static void main(String[] args) throws FileNotFoundException {
//Declare String Variables
String name = null;
String grade;
String inFile;
String outFile;
PrintWriter outputFile;
//Declare Numerical Variables
double score1 = 0;
double score2 = 0;
double score3 = 0;
double score4 = 0;
double score5 = 0;
double score6 = 0;
double score7 = 0;
double score8 = 0;
double count = 0;
double average;
//Capture Student Info
while(scanFile.hasNext()){
name = scanFile.nextLine();
if (scanFile.hasNextInt()){
score1 = scanFile.nextInt();
count++;
if (score1 == -1){
}
break;
else if (score1 != -1)
score2 = scanFile.nextInt();
count++;
if (score2 == -1){
count--;
break;
}
else if (score2 != -1)
score3 = scanFile.nextInt();
count++;
if (score3 == -1){
count--;
break;
}
else if (score3 != -1)
score4 = scanFile.nextInt();
count++;
if (score4 == -1){
count--;
break;
}
else if (score4 != -1)
score5 = scanFile.nextInt();
count++;
if (score5 == -1){
count--;
break;
}
else if (score5 != -1)
score6 = scanFile.nextInt();
count++;
if (score6 == -1){
count--;
break;
}
else if (score6 != -1)
score7 = scanFile.nextInt();
count++;
if (score7 == -1){
count--;
break;
}
else if (score7 != -1)
score8 = scanFile.nextInt();
count++;
}
}
//Processed data for student
average = findAverage(score1, score2, score3, score4, score5, score6, score7, score8, count);
grade = letterGrade(average);
//Printing Output File
outputFile.print("Grade Report for Introduction to Programming I\n\n");
outputFile.print("This program will process test scores.");
//Output
printFile(outputFile, name, count, average, grade);
//}
outputFile.close();
}
示例输入文件
John Sweet
87 76 90 100 -1
Ali Hassan
-1
Willy Nilly
73 63 74 70 -1
Juju Smith Jr.
89 90 78 88 -1
Karl Kavington III
90 100 80 70 -1
Lary Howard Holiday
80 77 67 67 -1
Leo Gordon
56 88 780 77 -1
Jessy Brown
-1
Mr. Perfect
100 100 100 100 -1
Mr. Missing It All
0 0 0 0 0 0 -1
最佳答案
我猜你的目标是获得每个学生的平均成绩,在这种情况下,代码将是这样的(而不是你的“手动循环”方法):
while(scanFile.hasNext()){ //get average of each student
name = scanFile.nextLine();
double count = 0, totalScore = 0;
while (scanFile.hasNextInt()){
totalScore = scanFile.nextInt();
count++;
}
double average = findAverage(totalScore, count);
//Processed data for student
grade = letterGrade(average);
}
注意,我已经更改了调用 findAverage
方法的方式,在代码中更改它应该相当简单。得到平均值后,用它们做任何你需要做的事情。
我认为您仍然对 Java 中的基本循环有疑问,我建议您阅读更多有关如何使用它们的信息,这里有 recommendation .
关于Java - 循环和特定字符,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55755932/