Chapter 4: Programming in Matlab - College of the Redwoods

Section 4.2 Control Structures in Matlab 303
if n==1
fprintf(’The sum of %0.2f and %0.2f is %0.2f.\n’,a,b,a+b)
elseif n==2
fprintf(’The difference of %0.2f and %.2f is %.2f.\n’,a,b,a-b)
elseif n==3
fprintf(’The product of %.2f and %.2f is %.2f.\n’,a,b,a*b)
elseif n==4
fprintf(’The quotient of %.2f and %.2f is %.2f.\n’,a,b,a/b)
else
fprintf(’Not a valid choice.\n’)
end
Save this script as mymenu.m, then execute the command mymenu at the
command window prompt. You will be prompted to enter two numbers a and b.
As shown, we entered 15.637 for a and 28.4 for b. The program presents a menu
of choices and prompts us for a choice.
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:
We enter 1 as our choice and the program responds by adding the values of a and
b.
Enter your choice: 1
The sum of 15.64 and 28.40 is 44.04.
Some comments are in order.
1. Note that after several elseif statments, we still list an else command to catch
invalid entries for n. The choice for n should match a menu designation, either
1, 2, 3, or 4, but any other choice for n causes the statement following else to