计算数组中的平均值 [英] Calculate Average in arrays
本文介绍了计算数组中的平均值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想使用数组计算平均值.我想让程序询问成绩的数量,然后再输入成绩编号.
I want to calculate the average numbers using arrays. I want the program asks for the amount of grades and after I want to put the grade numbers.
我想以 double
的形式获得平均输出.
After I want to get the average output in a double
.
到目前为止,这是我的代码:
This is my code so far:
public class Average {
public static void main(String[] args)
{
//int n = MyConsole.readInt("Enter number of grades: " );
int a = MyConsole.readInt("Enter grade 1: " );
int b = MyConsole.readInt("Enter grade 2: " );
int c = MyConsole.readInt("Enter grade 3: " );
int[] numbers = new int[]{a,b,c};
numbers[0] = a;
numbers[1] = b;
numbers[2] = c;
int sum = 0;
for(int i=0; i < numbers.length ; i++)
sum = sum + numbers[i];
double average = sum / numbers.length;
System.out.println("Average value of array elements is : " + average);
}
}
推荐答案
不知道您的类 MyConsole
在做什么,但是我猜想是 Scanner
:
Don't know what your class MyConsole
is doing, but I guess is a Scanner
:
您改进的代码将如下所示:
Your code improved will be something like this:
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter number of grades: " );
int n = sc.nextInt();
int sum = 0;
for (int i = 0; i < n; i++) {
System.out.print("Enter grade "+ (i + 1) + ": ");
int a = sc.nextInt();
sum += a;
}
double average = sum / n;
System.out.println("Average value of array elements is : " + average);
}
输出(2年级):
Enter number of grades: 2
Enter grade 1: 1
Enter grade 2: 5
Average value of array elements is : 3.0
输出(5年级):
Enter number of grades: 5
Enter grade 1: 10
Enter grade 2: 20
Enter grade 3: 30
Enter grade 4: 10
Enter grade 5: 50
Average value of array elements is : 24.0
注意
double average = sum / n;
执行int除法,因此您将没有小数位!我建议快速投放:
performs an int division, so you won't have any decimal places! I would propose a fast cast:
double average = sum / (double) n;
具有新输出:
Enter number of grades: 2
Enter grade 1: 1
Enter grade 2: 4
Average value of array elements is : 2.5
GUESS 使用您自己的课程:
public static void main(String[] args) {
int sum = 0;
int n = MyConsole.readInt("Enter number of grades: " );
for (int i = 0; i < n; i++) {
int a = MyConsole.readInt("Enter grade "+ (i + 1) + ": ");
sum += a;
}
double average = sum / n;
System.out.println("Average value of array elements is : " + average);
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