Chapter 4: Programming in Matlab - College of the Redwoods

388 Chapter 4 Programming in Matlab
Next, add the following lines at the very bottom of the file rationalArithmetic.m.
function d=rationalGCD(a,b)
while true
a=mod(a,b);
if a==0
d=b;
return
end
b=mod(b,a);
if b==0
d=a;
return
end
end
Actually, the order of the subfunctions is irrelevant, but collecting them at the
bottom of the primary function M-file rationalArithmetic.m is a good practice,
making them easy to find and separating them from the main body of code.
However, the order in which they appear at the bottom of the primary function
file rationalArithmetic.m makes no difference to execution.
Activating Menu Items. We now need to write some code so that when the
user selects the first menu item (Reduce a fraction to lowest terms), two things
will happen:
1. The user will be asked to input the numerator and denominator of the fraction
she wants reduced.
2. The program will output an equivalent fraction that is reduced to lowest terms.
With these thoughts in mind, add these lines to rationalArithmetic.m just
after case 1.