我如何在While循环中使用Java扫描仪 [英] how can i use java scanner in while loop

问题描述

这是我到目前为止所拥有的:

This is what I have so far:

int question = sc.nextInt(); 

while (question!=1){

    System.out.println("Enter The Correct Number ! ");

    int question = sc.nextInt(); // This is wrong.I mean when user enters wrong number the program should ask user one more time again and again until user enters correct number.
    // Its error is : duplicate local variable

}

推荐答案

您正在尝试重新声明循环中的变量.您只想给 existing 变量赋予一个不同的值:

You are trying to redeclare the variable inside the loop. You only want to give the existing variable a different value:

while (question != 1) {
    System.out.println("Enter The Correct Number ! ");
    question = sc.nextInt();
}

这只是一个赋值，而不是一个声明.

This is just an assignment rather than a declaration.

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