Question

我尝试编写一个程序，它接受两个用户并计算它们之间的数字之和（加上它们自己的数字）。但是我遇到了一个错误！这是我的代码：

glDrawArrays:714: [MALI] glDrawArrays takes more than 5ms here. Total elapse time(us): 8248

错误：

import java.util.Scanner;

public class ForLoop {

    public static void main(String[] args) {
        int sum =0;
        System.out.print("Enter first number: ");
        Scanner myScanner = new Scanner(System.in);
        boolean firsttest;
        if(firsttest = myScanner.hasNextInt()) {
            int firstNumber = myScanner.nextInt();
            System.out.print("Enter second number: ");
                boolean secondtest;
                if(secondtest = myScanner.hasNextInt()) {
                    int secondNumber = myScanner.nextInt();
                    for(firstNumber ; firstNumber <= secondNumber ; firstNumber++) {
                        sum = sum + firstNumber ;
                    }
                }else {
                    System.out.println("Second number is not correct format.");
                }
        }else {
            System.out.println("first number is not correct format.");
        }
            System.out.println("total= " + sum);
    }

}

Answer 1

更改

for(firstNumber ; firstNumber <= secondNumber ; firstNumber++)

到

for(; firstNumber <= secondNumber ; firstNumber++)

Answer 2

这里不需要for循环的第一部分。该值已定义，并已初始化[02/Dec/2017:15:49:13 +0300] "POST /api/v1/user/register HTTP/1.1" 500 16904 "-" "GuzzleHttp/6.2.1 curl/7.55.0 PHP/7.1.9"

因此，你想要

int firstNumber = myScanner.nextInt();

看起来很奇怪，所以尝试一下while循环

for( ; firstNumber <= secondNumber ; firstNumber++) {
    sum = sum + firstNumber ;
}

此外，while(firstNumber <= secondNumber) { sum = sum + (firstNumber++); }也适用

函数循环错误

2 个答案: