Check out example codes for "for loop in c++ hackerrank solution". It will help you in understanding the concepts better.

Code Example 1

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b;
    string c[]={"","one","two","three","four","five","six","seven","eight","nine"};
    cin>>a>>b;
    for(int i=a;i<=b;i++)
        cout<<((i<=9)?c[i]:((i%2==0)?"even":"odd"))<<endl;
}

Code Example 2

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b;
    string c[]={"","one","two","three","four","five","six","seven","eight","nine"};
    cin>>a>>b;
    for(int i=a;i<=b;i++)
        cout<<((i<=9)?c[i]:((i%2==0)?"even":"odd"))<<endl;
}

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