Question

您好我需要在数组中打印出一些元素，但只有那些实际上已分配了值。到目前为止，我有这个：

for(int h = 0; h < max; h++)
{
    ofile <<  v[h].getDay() << '/' << v[h].getMonth() << '/' << v[h].getYear() << ", "
          << v2[h].getHour() << ':' << v2[h].getMinute() << ':' << v2[h].getSecond() << v2[h].getAMPM() << ", "
          << v3[h].getPrice() << ", " << v3[h].getVolume() << ", " << v3[h].getValue() << endl; ///outputs the data to an output file

}

max = 40

但是，我的输出将是：

 10/10/2013, 4:57:27 PM, 5.81, 5000, 29050
 10/10/2013, 4:48:5 PM, 5.81, 62728, 364450
 10/10/2013, 4:10:33 PM, 0, 0, 0
 10/10/2013, 4:10:33 PM, 0, 0, 0
 10/10/2013, 4:10:33 PM, 0, 0, 0
 10/10/2013, 4:10:33 PM, 5.55, 451, 2620.31
 10/10/2013, 4:10:33 PM, 5.81, 5000, 29050
 10/10/2013, 4:10:33 PM, 5.81, 145, 842.45
 10/10/2013, 4:10:33 PM, 5.81, 9241, 53690.2
 10/10/2013, 4:10:33 PM, 5.81, 8759, 50889.8
 10/10/2013, 4:10:33 PM, 5.81, 1875, 10893.8
 10/10/2013, 4:10:33 PM, 5.81, 58, 336.98
 10/10/2013, 4:10:33 PM, 5.81, 1370, 7959.7
 10/10/2013, 4:10:33 PM, 5.81, 90000, 522900
 10/10/2013, 4:10:33 PM, 5.81, 638, 3706.78
 10/10/2013, 4:10:33 PM, 5.81, 4231, 24582.1
 10/10/2013, 4:10:33 PM, 5.81, 71191, 413620
 10/10/2013, 4:10:33 PM, 5.81, 21878, 127111
 10/10/2013, 4:10:33 PM, 5.81, 6760, 39275.6
 10/10/2013, 4:10:33 PM, 5.81, 21340, 123985
 10/10/2013, 4:10:33 PM, 5.81, 4000, 23240
 10/10/2013, 4:10:33 PM, 5.81, 4750, 27597.5
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0
 0/0/0, 0:0:0, 0, 0, 0

这些0是未分配的值，但我只想打印指定的值我怎么能这样做？

由于

Answer 1

只需修改循环条件，一旦遇到第一个零，循环就会停止：

for(int h = 0; (h < max) && (v[h].getDay() > 0); h++)

Answer 2

您可以添加if-else子句并测试某个值是否为0，例如v3[h].getPrice()或v[h].getDay()，具体取决于您是否希望指定的天数为零值。

类似的东西：

for(int h = 0; h < max; h++)
{
    if(v3[h].getPrice()==0){
        continue;
    } else {
    ofile <<  v[h].getDay() << '/' << v[h].getMonth() << '/' << v[h].getYear() << ", "
          << v2[h].getHour() << ':' << v2[h].getMinute() << ':' << v2[h].getSecond() << v2[h].getAMPM() << ", "
          << v3[h].getPrice() << ", " << v3[h].getVolume() << ", " << v3[h].getValue() << endl; ///outputs the data to an output file
    }
}

如何在c ++中只打印数组中指定的元素？

2 个答案: