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Update 165. Compare Version Numbers.md

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solutions/165. Compare Version Numbers.md
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@ -18,6 +18,11 @@
这里我们使用istringstream。
学习几个这里需要用到的stringstream的成员函数:
* `good()`: 判断是否没有错误；
* `bad()`: 与`good()`相反，判断是否存在错误；
* `eof()`: 判断是否到达end-of-file；
**注意学习这种将字符串按照某个字符分割开的处理方法！！！**
@ -51,17 +56,21 @@ public:
class Solution {
public:
int compareVersion(string version1, string version2) {
istringstream v1(version1 + '.'), v2(version2 + '.');
istringstream is1(version1 + '.'), is2(version2 + '.');
int num1, num2;
char dot = '.';
while(v1.good() || v2.good()){ // 函数good判断输入流是否good
num1 = 0; num2 = 0;
if(v1.good()) v1 >> num1 >> dot;
if(v2.good()) v2 >> num2 >> dot;
char cdot;
if(num1 != num2)
return num1 > num2 ? 1 : -1;
# define OK1 is1.good() // 或者 !is1.fail(), !is1.eof()
# define OK2 is2.good()
while(OK1 || OK2){
num1 = num2 = 0;
if(OK1) is1 >> num1 >> cdot;
if(OK2) is2 >> num2 >> cdot;
if(num1 > num2) return 1;
else if(num1 < num2) return -1;
}
return 0;
}
};