从NXC中的文件返回的负值

问题描述

我将值保存到NXC（不是XC）中的.csv文件中，然后在以后的某个时间点调用它们。我遇到的问题是，从单元格中调用任何负值时，它显示为0123而不是-123，这使我所有其他计算都无法进行。

I am saving values to a .csv file in NXC(Not eXactly C) and then calling on them ata later point in time. The problem I am having is when calling any negative values back from a cell it is displayed as 0123 instead of -123 which is throwing all my additional calculations off.

当前代码是：

OpenFileRead("map.csv", fSize, count);
  until (eof == true) {
    ReadLnString(count, val);
    int lstFwd = StrToNum(val);
    NumOut(0,LCD_LINE1,lstFwd);
  }
while(true);

谁能解释如何纠正此问题，因为它现在给我造成了很大压力。 / p>

Can anyone explain how to rectify this issue as it is causing me a great deal of stress now.

推荐答案

StrToNum应该转换负数。整数从0开始有点奇怪。您还应该使用增强型NBC / NXC固件。

StrToNum should convert negativ numbers. Its a bit strange that an integer number starts with 0. You should also use Enhanced NBC/NXC firmware.

首先：您应该始终在写一些输出之前清除屏幕！
使用：

First: You should always clear the screen before writing some output!Use:

NumOut(0,LCD_LINE1,lstFwd, DRAW_OPT_CLEAR_LINE);

如果问题仍然存在，请尝试：

If the problem still exists try:

string val;
OpenFileRead("map.csv", fSize, count);
  until (eof == true) {
    ReadLnString(count, val);
    int lstFwd = StrToNum(val);
    if(SubStr(val, 0, 1) == "-") lstFwd *= -1; // Check if first char is "-"
    NumOut(0,LCD_LINE1,lstFwd, DRAW_OPT_CLEAR_LINE);
  }
while(true);

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