Chapter 4: Programming in Matlab - College of the Redwoods

Section 4.2 Control Structures in Matlab 305
However, instead of using an if ...elseif...else...end control structure to select a
block of statments to execute based on the user’s choice of menu item, we will
implement a switch structure instead.
switch n
case 1
fprintf(’The sum of %.2f and %.2f is %.2f.\n’,a,b,a+b)
case 2
fprintf(’The difference of %.2f and %.2f is %.2f.\n’,a,b,a-b)
case 3
fprintf(’The product of %.2f and %.2f is %.2f.\n’,a,b,a*b)
case 4
fprintf(’The quotient of %.2f and %.2f is %.2f.\n’,a,b,a/b)
otherwise
fprintf(’Not a valid choice.\n’)
end
Save the script as mymenuswitch.m, change to the command window, and enter
and execute the command mymenuswitch at the command prompt. Note that
the behavior of the program mymenuswitch is identical to that of mymenu.
Enter a number a: 15.637
Enter a number b: 28.4
1) Add a and b.
2) Subtract b from a.
3) Multiply a and b.
4) Divide a by b.
Enter your choice: 1
The sum of 15.64 and 28.40 is 44.04.
If the user enters an invalid choice, note how control is passed to the statment
following otherwise.