Answer from cs61c-cj (Peter Lau 16539384) for Question 1
C could function if it only had "if" and "goto" statements.  The "while" statement is an "if" statement that has a "goto" clause to repeat the loop if a condition is satisfied.  The "do while" statement is a modification on the "while" statement.  The designers of C included them all probably to make C closer to lingual logic.  People think in terms of their language such as "while <a condition is true>, then I should ..."  But C could certainly function without the "while" and "do while" statement.