Advanced control-flow: nesting, break, continue, and switch

Example: Rock-Paper-Scissors

ROCK = 1; PAPER = 2; SCISSORS = 3;

if p1 == ROCK
    if p2 == PAPER
        winner = 2;
    elseif p2 == SCISSORS
        winner = 1;
    else
        winner = 0;
    end
elseif p1 == PAPER
    if p2 == ROCK
        winner = 1;
    elseif p2 == SCISSORS
        winner = 2;
    else
        winner = 0;
    end
else % p1 == SCISSORS
    if p2 == ROCK
        winner = 2;
    elseif p2 == PAPER
        winner = 1;
    else
        winner = 0;
    end
end

Example: break and continue

for i = [4 9 16 20 24 36 49]
    if rem(sqrt(i), 1) ~= 0
        break
    end
    disp(sqrt(i))
end




for i = [4 9 16 20 24 36 49]
    if rem(sqrt(i), 1) ~= 0
        continue
    end
    disp(sqrt(i))
end

switch statement

General syntax:

switch expression
    case value1
        statements
    case value2
        statements
    ...
    otherwise
        statements
end

Example: Rock-Paper-Scissors revisited

ROCK = 1; PAPER = 2; SCISSORS = 3;
switch p1
    case ROCK
        switch p2
            case PAPER
                winner = 2;
            case SCISSORS
                winner = 1;
            case ROCK
                winner = 0;
        end 
    case PAPER
        switch p2
            case ROCK
                winner = 1;
            case SCISSORS
                winner = 2;
            case PAPER
                winner = 0;
        end
    case SCISSORS
        switch p2
            case ROCK
                winner = 2;
            case PAPER
                winner = 1;
            case SCISSORS
                winner = 0;
        end
end

Example:

choice = input('Yes or no? (y/n) ', 's');
switch choice
    case {'Y', 'y'}
        disp('yes')
    case {'N', 'n'}
        disp('no')
    otherwise
        disp('unknown choice')
end