21.What is the use of a label statement in C++? 22.List the merits and demerits of while-do loop and do-while loop 23.Why is goto not necessary for a structured programming language like C++?...

21.What is the use of a label statement in C++?

22.List the merits and demerits of while-do loop and do-while loop

23.Why is goto not necessary for a structured programming language like C++?

24.Summarise the syntactic rules of the following loop statements:

(a)for loop

(b) while-do loop

(c) do-while loop

25.Explain the following with suitable examples:

(d) conditional expression (b) arithmetic expression

(c) logical expression (d) boolean expression