careercup-1.4

#include<iostream>
#include<string>
#include<cctype>
using namespace std;

string replacespace(string str)
{
    if(str.empty())
        return "";
    int i;
    int len=str.length();
    string res;
    for(i=0;i<len;i++)
    {
        if(isspace(str[i]))
            res+="%20";
        else
            res+=str[i];
    }
    return res;
}

int main()
{
    string str="We are Happy";
    cout<<replacespace(str)<<endl;
}