How do I change the display of my answers if condition is not met?

2 次查看（过去 30 天）
Aaron
Aaron 2012-6-28
Here is what I have so far:
*format compact
a=input('Enter value for side a: ');
if a <= 0
disp('Not a valid input.');break;
end
b=input('Enter value for side b: ');
if b <= 0
disp('Not a valid input.');break;
end
c=input('Enter value for side c: ');
if c <= 0
disp('Not a valid input.');break;
if a > b+c
fprintf('\n');
disp('Error: Side "a" must be less than the sum of sides b & c.') %
elseif b > a+c
fprintf('\n');
disp('Error: Side "b" must be less than the sum of sides a & c.')
elseif c > a+b
fprintf('\n');
disp('Error: Side "c" must be less than the sum of sides a & b.')
end
fprintf('\n');
A=acosd((b^2+c^2-a^2)/(2*b*c));
B=acosd((a^2+c^2-b^2)/(2*a*c));
C=acosd((a^2+b^2-c^2)/(2*a*b));
disp('Results:')
fprintf('Angle A = %G',A);disp(' degrees')
fprintf('Angle B = %G',B);disp(' degrees')
fprintf('Angle C = %G',C);disp(' degrees') *
When the conditions that provide the "Error" message are not met, I still get something like:
Angle A = 180 degrees Angle B = 0 degrees Angle C = 0 degrees
But I would like to have my program display something when there could be no viable answers, like:
Angle A = NaN degrees Angle B = NaN degrees Angle C = NaN degrees
or
Any message I choose.

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采纳的回答

Sean de Wolski
Sean de Wolski 2012-6-28
Why don't you use error() instead of disp('...') to actually abort the program when the error is encountered.
Or, to keep what you have and make the if-decision tree work:
if
elseif
elseif
else
%we haven't errored, woohoo!
fprintf('\n');
A=acosd((b^2+c^2-a^2)/(2*b*c));
B=acosd((a^2+c^2-b^2)/(2*a*c));
C=acosd((a^2+b^2-c^2)/(2*a*b));
disp('Results:')
fprintf('Angle A = %G',A);disp(' degrees')
fprintf('Angle B = %G',B);disp(' degrees')
fprintf('Angle C = %G',C);disp(' degrees') *
end

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