问题描述
我编写了这个简单的程序来求和用户写入的扫描 int，但是当我编译它，它说字符串不能转换为int".这个程序有什么问题?
I wrote this simple program to sum a scanned int written by the user, but when i compile it, it says that "string cannot be converted to int." What is wrong in this program?
import java.util.*;
public class Pr6{
public static void main(String[] args){
Scanner scan = new Scanner (System.in);
int num1;
int num2;
int num3;
int sum;
System.out.print("Please write an integer: ");
num1 = scan.nextLine();
System.out.print("Please write an integer: ");
num2 = scan.nextLine();
System.out.print("Please write an integer: ");
num3 = scan.nextLine();
sum = num1 + num2 + num3;
System.out.print("Total = " + sum);
}//main
}//Pr6推荐答案
这是你的问题
num1 = scan.nextLine();
我们看看num1是什么数据类型:
Let's look at what data type num1 is:
int num1;
scan.nextLine() 将返回一个字符串.而且你不能有 int num1 = "1"，因为它们是不同的数据类型.
scan.nextLine() will return a String. And you can't have int num1 = "1", because they are different data types.
您应该使用 scan.nextInt().它将返回一个数字.这会解决你的问题:)
You should use scan.nextInt(). It will return a number. That'll solve your problems :)
所以你会有 num1 = scan.nextInt()、num2 = scan.nextInt() 和 num3 = scan.nextInt().
So you'll have num1 = scan.nextInt(), num2 = scan.nextInt(), and num3 = scan.nextInt().
我希望这会有所帮助.祝你好运！
I hope that helps. Good luck!
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