英文:
Average of numbers program outputting incorrect result
问题
尝试编写一个简单的程序来计算3个整数值的平均值，但它似乎总是计算出错误的平均值。
import java.util.Scanner;
public class IntegerAverage {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int num1;
int num2;
int num3;
// 询问用户
System.out.println("输入第一个数字");
num1 = in.nextInt();
System.out.println("输入第二个数字");
num2 = in.nextInt();
System.out.println("输入第三个数字");
num3 = in.nextInt();
// 输出答案
System.out.println("平均值是：" + ((num1 + num2 + num3) / 3));
}
}
感谢您的帮助
英文:
Am trying to write simple program to find average of 3 int values, but it always seems to get the average wrong
import java.util.Scanner;
public class IntegerAverage {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int num1;
int num2;
int num3;
// Ask user
System.out.println("Input 1st number");
num1 = in.nextInt();
System.out.println("Input 2nd number");
num2 = in.nextInt();
System.out.println("Input 3rd number");
num3 = in.nextInt();
// Print answer
System.out.println("The average is:"+ ((num1 + num1 + num3)/3));
}
}
Help is greatly appreciate
答案1
得分: 1
除了已经在上面提到的两次num1和缺少的num2，你将始终只会得到整数结果，例如对于num1 = 1，num2 = 2和num3 = 2，你的代码将会将1作为结果绘制，而不是1.667。你可以通过写入以下内容来强制在输出中获得双精度结果：
System.out.println("The average is:" + ((num1 + num2 + num3) / 3.0));
英文:
Besides having num1 twice and missing num2, as already mentioned above, you will always get integer-results only, e.g. for num1 = 1, num2 = 2 and num3 = 2 your code will plot 1 as result instead of 1.667. You might enforce double-results in your output by writing
System.out.println("The average is:"+ ((num1 + num2 + num3) / 3.0));
答案2
得分: 0
它应该是这样的：
import java.util.Scanner;
public class IntegerAverage {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int num1;
int num2;
int num3;
// 询问用户
System.out.println("输入第一个数字");
num1 = in.nextInt();
System.out.println("输入第二个数字");
num2 = in.nextInt();
System.out.println("输入第三个数字");
num3 = in.nextInt();
// 输出答案
System.out.println("平均值为：" + ((num1 + num2 + num3) / 3));
}
}
你不小心把num1重复了一次，并且忘记了num2。
英文:
It's supposed to be:
import java.util.Scanner;
public class IntegerAverage {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int num1;
int num2;
int num3;
// Ask user
System.out.println("Input 1st number");
num1 = in.nextInt();
System.out.println("Input 2nd number");
num2 = in.nextInt();
System.out.println("Input 3rd number");
num3 = in.nextInt();
// Print answer
System.out.println("The average is:"+ ((num1 + num2 + num3)/3));
}
}
You accidentally added num1 twice, and forgot num2.
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