Chapter 2: logical statements

The flow of information through a program is often determined by a set of logical statements, such as:

if A,

{execute commands based on truth of A}

else if B,

{execute commands based on truth of B}

else if C,

{execute commands based on truth of C}

else

{execute default commands}

end

The series of statements enclosed by if...else...elseif...elseif...end are executed differentially depending on whether the logical statements A or B or C are TRUE. A, B, C are propositions whose truth values we set earlier in the program. Here we will use the built-in random number generator to practice using the if...else....elseif logical structure.

N=rand([1 2]);

if all(N>.5), ['option 1']

elseif all(N<.5), ['option 2']

else ['default option'], end

The output will be one of the three options. Which is least likely? What happens if it is possible for more than one option to be true?