Answer 1

Selection Logic:

1. This logic employs a number of conditions and these conditions select the module among several alternative modules.
These are the types of conditional structures:

2.Single Alternative:
If condition holds true then Module A is executed, otherwise Module A is skipped and control transfers to the next step of algorithm.
Form of the structure:
If condition, then:
[Module A]
[End of IF Structure]

3. Double Alternative
This structure has following form
IF condition, then:
      [Module A]
Else:
      [Module B]
[End of IF Structure]
if condition is true Module A is executed and if condition is false  Module B is executed.