IBM Software Developer interview questions

Got a referral for a job opening, phone screening with a recruiter, didn't continue to the next round. The interview was a discussion about my professional background, interests, etc. Overall, the conversation was outgoing and with a good vibe, but I didn't match the needed requiermnets in relation to proffesional skills.

The Technical Round Was So Good, The Person Is Nice, They Ask Me About My Project That Is Core Banking Solution. Then Moving Next They Ask Me About OOPs Concept In Detail, That Is Class, Object, APIE. 1) Practical Question Ask On OOPs i.e. Virtual Function 2) Palindrome Number Question (int , string) 3) Permutetion Combination for an string "abc"