please help me write a program for a quadratic formula in matlab telling me the exact command keys

The solutions of the quadratic equation ax2+bx+c=0 are given by the quadratic formula.

The discriminant D=b^2-4ac is used to predict the number of roots.  There are three cases:
1. if D>0 there are two real solutions 
2. If D= there is one real solution 
3.If D<0 there are no real solutions 
write a program that performs each of the following tasks:
i.the program prompts the user to input a,b, and c
ii. the program computes the discriminant D which it uses the conditional 
if..elseif..else to determine and output the number of solutions
iii.the program should also output the solutions if any

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer