C++ expressions.

Q19. Write the C++ equivalent expressions for the following:

1. volume = 3.1459 r²h / 3
2. F_n = 0.5 if x = 30
3. f_n = 0.9 if x = 60

Ans.(1). volume = (3.1459*r*r*h) / 3 ;

Ans.(2). Fn = x==30 ? 0.5 : 0;

Ans.(3). fn = x==60 ? 0.9 : 0 ;