写一个函数，检查字符是否是整数，如果是，返回其整数值。求高手指点一下，谢谢！

我用java写的，希望对你有用
public int atoi(String s)
{

int s_index = 0; //string index, for conversion
byte num_sign = 1; //sign of the result number
int number = 0; //result number

//check the input string length
if (s.length() <= 0)
{ System.out.println("input string length is incorrect. should be larger than 0");
return 0;
}
//System.out.println("input string is "+s);
//check the sign
if (s.charAt(0) == '-' || s.charAt(0) == '+')
{ if (s.charAt(0) == '-')
num_sign = -1;
s_index = 1;
}
for (int i=s_index; i<s.length(); i++)
{

if (s.charAt(i) >= '0' && s.charAt(i) <= '9')
{
//System.out.println("string at "+i+" is "+s.charAt(i));
number = number*10 + (s.charAt(i) - '0');

}
else {
if (s.charAt(i) != '.')
System.out.println("input string has wrong characters. should be digits 0-9");
break;
}
}
return num_sign*number;
}

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