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将扼杀变成愤怒——每次代表
原标题:Convert a string into an integer - each representation
  • 时间:2010-01-28 16:27:24
  •  标签:
  • c
  • integer

是否有职能或图书馆可以将 任何>(default, octal, hex, ...)在C中作为“条码”列入<条码/条码>,长期寄至

实例:

1
1l
1ul
42e+10
0x2aLL
01234u
...

atoi在0x...和suffixes u/l方面有一些问题。

最佳回答

。 这只字不提,但既然你总是重写一个<条码>,长期,你就不真正地看看看看看着什么。 我不相信,它将使用<代码>42e+10<>/code>——尽管产生值为一种分类,但C和C++仅界定了浮动点号码的电子名称。

除此以外,您需要/必须通过<代码>0作为换算基,在这种情况下,它执行通常的C公约,即:主要编码<0信号 octal,0x,信号六dec,和1-9 信号 decimal。

问题回答

你们可以使用扫描仪,检查返回价值,看看它是否有用,例如:

bool parseValue (const char *buffer, long &value)
{
if (sscanf(buffer,"%ld",&value)==1) return true;
if (sscanf(buffer,"0x%lx",&value)==1) return true;
...
return false;
}

You can easily add more kinds of formats to this list. To extend this for floating point values as well, scan the buffer in a floating point value then cast or round it to the integer value, like this:

bool parseValue (const char *buffer, long &value)
{
if (sscanf(buffer,"%ld",&value)==1) return true;
if (sscanf(buffer,"0x%lx",&value)==1) return true;
...
double d;
if (sscanf(buffer,"%lf",&d)==1) {value=d; return true;}
...
return false;
}




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