Java程序僅輸出一行代碼

Question

我的班級Java程序出現問題。 我必須創建一個程序來提示用戶輸入輸出文件的路徑和名稱，該文件將包含我的程序將采用的方程式的系數行，並使用二次公式計算解。 到目前為止，我認為除了我的輸出文件之外，其他一切都正確。 假設我有一個包含3行系數的輸入文件，我的程序將在控制台流中顯示解決方案，但是在我的輸出文件上僅顯示1行解決方案。

while (input.hasNext()) {

    a = input.nextInt();
    b = input.nextInt();
    c = input.nextInt();

    discriminant = Math.pow(b, 2) - 4 * a * c;
    ///There will be no solutions if discriminant<0
    if (discriminant < 0){
        System.out.println("There are no solutions.");
        output.println("There are no solutions.");
    }
    ///As with the above, if coefficent a = 0 no solutions
    else if (a == 0){
        System.out.println("There are no solutions.");
        output.println("There are no solutions.");
    }
    else if (discriminant == 0){
       solutionOne = (-b + Math.sqrt(discriminant)) / (2 * a);
       if (b < 0) {
           System.out.printf("%3.0fx^2 %3.0fx + %3.0f, has one      solution:%5.3f%n",a,b,c,solutionOne);
           output.printf("%3.0fx^2 %3.0fx + %3.0f has one solution:%5.3f%n",a,b,c,solutionOne);
        }
       else{
           System.out.printf("%3.0fx^2 %3.0fx + %3.0f has one  solution:%5.3f%n",a,b,c,solutionOne);
           output.printf("%3.0fx^2 %3.0fx + %3.0f has one solution:%5.3f%n",a,b,c,solutionOne);
       }

    }
       else if(discriminant>0){
           solutionOne=(-b + Math.sqrt(discriminant))/(2*a);
           twoSolutions=(-b - Math.sqrt(discriminant))/(2*a);

           if(b<0){
               System.out.printf("%3.0fx^2 %3.0fx + %3.0f has two solutions: %5.3f %5.3f%n",a,b,c,solutionOne,twoSolutions);
               output.printf("%3.0fx^2 %3.0fx + %3.0f has two solutions:5.3f %5.3f%n",a,b,c,solutionOne,twoSolutions);
           }

           else{

           System.out.printf("%3.0fx^2 %3.0fx + %3.0f has two solutions:%5.3f %5.3f%n",a,b,c,solutionOne,twoSolutions);
           output.printf("%3.0fx^2 %3.0fx + %3.0f has two solutions: %5.3f%5.3f%n",a,b,c,solutionOne,twoSolutions);
           }

    }

    output.close();

Answer 1

如果我正確閱讀了括號，則問題是您在打電話

output.close();

在循環的每次迭代結束時。 完成所有輸出的編寫后，需要在循環外調用該函數 。