Please implement a function to replace spaces in a string with "%20". For example, when the string is We Are Happy., the replaced string is We%20Are%20Happy.
class Solution {
public:
void replaceSpace(char *str,int length) {
if(str==NULL||length==0)
return;
int org_length=0;
int number=0;
int i=0;
while(str[i]!='\0')
{
++org_length;
if(str[i]==' ')
{
number++;
}
i++;
}
int new_length=org_length+number*2;
int index_new=new_length;
int index_old=org_length;
while(index_old>=0&&index_old<index_new)
{
if(str[index_old]==' ')
{
str[index_new--]='0';
str[index_new--]='2';
str[index_new--]='%';
}
else
{
str[index_new--]=str[index_old];
}
--index_old;
}
}
};