我应该编写一个程序,根据要输入的科目数量计算学生的平均成绩。
这是我的代码,但它不会在进入 subject1 的成绩部分执行:
import javax.swing.*;
public class Arrays {
static int ctr = 0;
public static void main(String[] args) {
String inputStr = "";
double num2process = 0.0;
double sum = 0.0, ave = 0.0;
double[] grade = new double[(int) num2process];
while (true) {
try {
inputStr = JOptionPane.showInputDialog(
"Enter number of subjects to enter: ");
num2process = Double.parseDouble(inputStr);
while (ctr < num2process) {
grade[ctr] = getNumber();
sum += grade[ctr];
ctr++;
}
} catch (NumberFormatException err) {
JOptionPane.showMessageDialog(
null,
"There is an error on entry",
"Error Message", JOptionPane.WARNING_MESSAGE);
continue;
}
break;
}
// Accumulate the output.
String output = "";
int ctr2 = 0;
output = "";
while (ctr2 > num2process) {
output += ("Grade on subject " + (ctr2+1)
+ " is " + grade[ctr]);
ctr2++;
}
ave = sum / num2process;
output += "\nAverage is " + ave;
// Display the output.
JOptionPane.showMessageDialog(
null,
output,
"The result is",
JOptionPane.INFORMATION_MESSAGE);
}
public static int getNumber() throws NumberFormatException {
String inputStr = "";
int num = 0;
try {
inputStr = JOptionPane.showInputDialog(
"Enter grade on subject " + (ctr+1));
num = Integer.parseInt(inputStr);
return num;
} catch (NumberFormatException errorAgain) {
throw errorAgain;
}
}
}
请帮我解决错误谢谢