Answer 1

Case 1: i=1..so 'if' condition is not satisfied, res=1 (res+i)
Case 2: i=2.. 'if' condition satisfied and continue statement is encountered and control goes for the next iteration
Case3: i=3 'if' condition not satisfied, res becomes 4 (1+3)
Case 4: loop condition is not satisfied
So res holds the value 4.