功能不强,比系统的略快。但胜在可以修改,都不进行安全判断,可以比系统的快上10倍。
//
char的函数能改进
// for循环可以增加并行性
// 负号的处理可以尝试改
public static int StringToInt( string s)
... {
int i = 0;
for (; i < s.Length; i++)
if (char.IsWhiteSpace(s[i]) == false)
break;
char negative = s[i]; //负数
if (negative == '-' || negative == '+') i++;
long result = 0; //改为int或者uint,快很多
for (; i < s.Length; i++)
...{
if (char.IsDigit(s[i]) == false) //如果能省略,快很多
throw new FormatException("Input string was not in a correct format.");
result = 10 * result + (s[i] - '0');
if (result > int.MaxValue) //如果能省略,快很多
throw new OverflowException("Value was either too large or too small for an Int32.");
}
return (int)(negative == '-' ? -result : result);
}
// for循环可以增加并行性
// 负号的处理可以尝试改
public static int StringToInt( string s)
... {
int i = 0;
for (; i < s.Length; i++)
if (char.IsWhiteSpace(s[i]) == false)
break;
char negative = s[i]; //负数
if (negative == '-' || negative == '+') i++;
long result = 0; //改为int或者uint,快很多
for (; i < s.Length; i++)
...{
if (char.IsDigit(s[i]) == false) //如果能省略,快很多
throw new FormatException("Input string was not in a correct format.");
result = 10 * result + (s[i] - '0');
if (result > int.MaxValue) //如果能省略,快很多
throw new OverflowException("Value was either too large or too small for an Int32.");
}
return (int)(negative == '-' ? -result : result);
}