Question

double total = 0;
    while(in.hasNextDouble()){
        double value = in.nextDouble();
        out.printf("%15.2f\n", value);
        total = total + value;
    }
out.printf("Total: %8.2f\n", total);

我尝试修改的代码的简短片段。它目前逐行输出输入文件中的所有内容。

    double total = 0;
    int count = 0;
    while(in.hasNextDouble()){

        if(count == 0){
            double value = in.nextDouble();
            out.printf("%4.2f", value);
            count = 1;
            total = total + value;
        }
        else if(count == 1){
            double value = in.nextDouble();
            out.printf("%15.2f\n", value);
            count = 0;
            total = total + value;
        }
    }

    if(count == 1){ 
        out.print("\n");
    }
    out.printf("Total: %8.2f\n", total);

我以这种方式修改它并且它有效，但我觉得它真的很长。我缺少一种较短的方法吗？

Answer 1

有很多方法可以做到这一点。一种方式：

double total = 0;
while(in.hasNextDouble()){
    double value = in.nextDouble();
     out.printf("%4.2f", value);
     total += value;

     if ( in.hasNextDouble() {
         double value = in.nextDouble();
         out.printf("%15.2f", value);
         total += value;
    } else {
        out.print("\n");
        break;
    }
    out.print("\n");
}
out.printf("\nTotal: %8.2f\n", total);

如何修改代码，以便将值写入两列？

1 个答案: