(a) By drawing a flowchart, explain the use of if-else-end structure in programming. (10 marks) (b) The following code is for calculating and plotting engineering stress and strain in a typical tension test. Find at least four errors in the code. For each error identified, explain why the error is caused. (10 marks) F-[0 13345 26689 40479 42703 43592 44482 44927 45372 46276); L-125 25.037 25.073 25.113 25.122 25.125 25.132 25.144 25.164] r0.0064 - + r "2 ; % AO is initial cross section area Stress-F.A0 stra n={L-LO) /LO 0 is initial gauge length fplot (Strain, Stress, k')