Cognizant Software Developer interview questions

What is printf What are data types

My interviewer was came by full of tension then he not even asked about me and self introduction, he asked me a id card for verification , i showed but he not get a clear pic so he said i gonna to end up this call.then after few mins he asked around 10 technical question and 3 programing question i answer all the programming question and answer 6-7 technical question even i said this he rejected me.