替换空格

class Solution {
public:
    void replaceSpace(char *str,int length) {
        int blankNum = 0;
        for(int i = 0; i <= length; i++){
            if(str[i] == ' ')
                blankNum++;
        }
        char *p = str + length;
        char *q = p + blankNum*2;
        for(int i = 0; i <= length; i++){
            if(*p == ' '){
                *q = '0';
                q--;
                *q = '2';
                q--;
                *q = '%';
                q--;
            }
            else{
                *q = *p;
                q--;
            }
            p--;
        }
    }
};

 

来源：https://www.cnblogs.com/olajennings/p/12456303.html