C ++位字符串到int转换 [英] C++ bit string to int conversion

问题描述

我试图将长度为'sLength'的位串（bitString）转换为int。
以下代码在我的计算机上适用于我。是否有可能无法正常工作？

  int toInt（string bitString，int sLength）{
 
 int tempInt; 
 int num = 0; 
 for（int i = 0; i  tempInt = bitString [i]  - '0'; 
 num = num + tempInt * pow（2，（sLength-1-i））; 
} 
 
 return num;先感谢提前
   h2_lin>解决方案
  pow 适用于双打。结果可能不准确。使用位算法
  num | =（1 <<<（sLength-1-i））* tempInt; 
  
不要忘记 bitString 包含除0和1之外的符号或太长
 
I am trying to convert a bit string (bitString) of length 'sLength' to an int.
The following code works fine for me in my computer. Is there any case where it may not work?
int toInt(string bitString, int sLength){

    int tempInt;
    int num=0;
    for(int i=0; i<sLength; i++){
        tempInt=bitString[i]-'0';
        num=num+tempInt * pow(2,(sLength-1-i));
    }

    return num;
}
Thanks in advance
解决方案
pow works with doubles. Result may be inaccurate. Use bit arithmetic instead
num |= (1 << (sLength-1-i)) * tempInt;
Don't also forget about cases when bitString contains symbols other than '0' and '1' or too long

                        
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