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原标题:C++ Operator (unsure of)

Is there a c++ operator that i could use for a for loop where it would add or subtract to variables based on whether one of the variables is less than or greater 0. For instance

int a;
int b;
for(int i=0;i<some_number; i++)
  result = a +< b
  result = a-> b
问题回答

页: 1

您可以与<代码>合并:的操作员。

int a;
int b;
for(int i=0;i<some_number; i++)
  result = (a < b)? result+b:result-b;

如果我正确理解你的榜样的话。

<代码>-> 是现有的参考操作者。

操作员<代码>: 是if...else的等值。 如果在<代码>之前的发言<>?评价true,则发言右边?上填写,则在后的发言:上执行。

你们是否希望这样做?

result += a > 0 ? b : -b;

Note that this will subtract b if a == 0, which isn t quite what you asked for.

这是否有助于?

result = a + (b*(a < b));
result = a - (b*(a > b));

基本上,(a < b)被转换成一个毛豆,基本上属于1(真实)或0(false)。 <代码>b乘以0当然是零,因此没有添加任何内容,<代码>b乘以1,准确为b





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