Hi there, I've tried all I could in order to complete a very simple and basic program that finds the roots of any quadratic binomial. You have to enter the coefficients a, b and c and it would find the roots. I could do that, but a problem occurred if I typed a=0. Of course if a=0 the binomial is not quadratic (and not even a binomial), so I wanted to let it know to the user of the program. Here my problems started... I don't know how to insert in my program that if a=0 then a message would appear saying that it isn't a quadratic binomial. Here it comes : I'm almost sure that I cannot type endif and then type if... But I tried many other things like and changing the order of the if statements... I always get errors and the program doesn't compile. Any help is appreciated. Note: If I erase the if (a=0) statement the program works well. (it compiles and find roots unless I type a=0).