剑指Offer总结——替换空格

class Solution {
public:
	void replaceSpace(char *str,int length) {
        int len = 0, resLen = 0;
        while(str[len] != '\0') {
            if(str[len] == ' ') {
                resLen += 2;
            }
            ++len;
            ++resLen;
        }
        while(len>=0) {
            if(str[len]==' ') {
                str[resLen--] = '0';
                str[resLen--] = '2';
                str[resLen--] = '%';
                --len;
            }
            else {
                str[resLen--] = str[len--];
            }
        }
	}
};