英文:
The sum of integers
问题
我想打印出从 a 到 b 之间所有整数的和，包括a和b。到目前为止，我停在这里：
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int j = b-a;
int total = 0;
for(int i = 0; i<=j ; i++){
total+=i;
}
System.out.println(total);
}
}
我做错了什么？
英文:
I would like to print the sum of all integers from a to b containing both. So far I have stopped at this:
import java.util.Scanner;
class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int j = b-a;
int total = 0;
for(int i = 0; i<=j ; i++){
total+=i;
}
System.out.println(total);
}
}
What I am doing wrong?
答案1
得分: 3
让 b=200，a=195，根据您的逻辑，j=(200-195)=5。通过循环，总和将为1+2+3+4+5=15。但您需要的是195+196+197+198+199+200的总和。
循环应该如下所示：
for(int i = a; i<=b ; i++){
total+=i;
}
英文:
Let b=200 and a=195, so according to your logic j=(200-195)=5. With the loop, the sum will be 1+2+3+4+5=15. But you need sum of 195+196+197+198+199+200.
The loop should go as:
for(int i = a; i<=b ; i++){
total+=i;
}
To understand how to debug a program please refer to https://techforhumans.site/java/right-way-to-debug-code-using-pen-and-paper/
答案2
得分: 1
这是您想要的吗？
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int total = 0;
for(int i = a; i<=b ; i++){
total+=i;
}
System.out.println(total);
}
当然，这只在 a < b 的情况下有效。
英文:
Is this what you want?
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int total = 0;
for(int i = a; i<=b ; i++){
total+=i;
}
System.out.println(total);
}
Of course this works only if a < b
答案3
得分: 1
你实际上没有将整数从 a 到 b 相加 - 你是在将所有整数从 0 到 a - b 相加。你的循环应该从 a 到 b，而不是从 0 到 a - b。
考虑当 a 为5，b 为10的情况 - 你应该相加 5 + 6 + 7 + 8 + 9 + 10，但是你当前的算法却相加了 0 + 1 + 2 + 3 + 4 + 5。
英文:
You're not actually adding the integers between the a and b - you're adding all of the integers from 0 to a - b. Your loop should actually be from a to b, not 0 to a - b.
Consider the case where a is 5 and b is 10 - you should be adding 5 + 6 + 7 + 8 + 9 + 10, but instead your current algorithm adds 0 + 1 + 2 + 3 + 4 + 5.
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