I am working on this problem for my one of my classes and can't seem to get it to work. Any suggestions?

Question

We use Gnu 2.1.73 and SciTE

fprintf('\nThis program solves the equation ax^2+bx+c=0 for x.\n\n');
a = input('Enter the coefficient a: ');
b = input('Enter the coefficient b: ');
c = input('Enter the coefficient c: ');

if(a==b==c==0)
fprintf('all possible solutions\n');
elseif(a==b==0)
fprintf('no possible solutions\n');
elseif(b^2-4*a*c < 0)
fprintf('no real solutions\n');
elseif(b^2-4*a*c ==0)
x = -b/(2*a)
fprintf('%3.2f.\n', x);
elseif(b^2-4*a*c > 0)
x1 = (-b+(((b^2)-4*a*c)^(1/2)))/(2*a)
x2 = (-b-(((b^2-4*a*c)^(1/2))))/(2*a)
fprintf('The quadratic equation has two solutions:');
disp([x1 x2]);
end;

fprintf('\nThis program solves the equation ax^2+bx+c=0 for x.\n\n');
a = input('Enter the coefficient a: ');
b = input('Enter the coefficient b: ');
c = input('Enter the coefficient c: ');
(d = b^2+4*a*c);
if (a==b==c==0)
fprintf('all possible solutions\n');
elseif (a==b==0)
fprintf('no possible solutions\n');
elseif (d < 0)
fprintf('no real solutions\n');
elseif (d==0)
x = -b/(2*a)
fprintf('The quadratic equation has one solution:');
disp([x])
else (d > 0)
(x1 = ((-b+d^1/2)/(2*a)));
(x2 = ((-b-d^1/2)/(2*a)));
fprintf('The quadratic equation has two solutions:');
disp([x1 x2]);
endif;

if i enter 1,0,1or any other combo of numbers is say "all possible solutions"
Also I believe if a=b=c=0 is not the same as a=b=0 because what if it is 0,0,1.

Answer 1

Hey,

I have a few suggestions. I am not familiar to SciTE, but it resembles Matlab which I've worked with.

Try setting a variable for your equation for the elseif comparisons.

ie. d = ax^2+bx+c

Then use elseif(d < 0);

You could also use if(d==0)
This would correct any issues dealing with the variables. In Matlab they have this horrible "dot notation". Where when a defined variable is altered you need to add a period/dot before it. Make sure there isn't anything like that required.

Also make sure you are using your if arguments correctly. Does the syntax support "and/or" arguments such as && / || ?

Answer 2

I don't know what is "Gnu 2.1.73 and SciTE" but you can check these items:
1- when (a=b=c=0) is true, then (a=b=0) will be true too. hence you will have both "all possible solutions" and "'no possible solutions" in output.
2- can you use an empty line?(as you have used in 5th line)
3- is it possible to use more than one "elseif" for each "if"?
4- don't you need any other command when you use "if"? (for instance an "endif" command)

Answer 3

Try again.

Answer 4

...dunno what Gnu 1.1.73 and SciTE are, but your solution equations seem to be unfinished.