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A simple program to solve quadratic equations with

, 8 Nov 2010 CPOL 20.4K 3
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Simple and prints imaginary roots too!float a,b,c,x1,x2,d,dsq;printf("ax^2 + bx + c = 0");printf("\nEnter a,b,c separated by commas : \n");scanf("%f,%f,%f",&a,&b,&c);d = b*b-(4*a*c);if(d>=0){dsq=sqrt(d);x1 = (-b+dsq)/(2*a);x2 = (-b-(dsq))/(2*a);printf("\nRoot 1 : %f\nRoot 2...
Simple and prints imaginary roots too!
float a,b,c,x1,x2,d,dsq;
printf("ax^2 + bx + c = 0");
printf("\nEnter a,b,c separated by commas : \n");
scanf("%f,%f,%f",&a,&b,&c);
d = b*b-(4*a*c);
if(d>=0)
{
dsq=sqrt(d);
x1 = (-b+dsq)/(2*a);
x2 = (-b-(dsq))/(2*a);
printf("\nRoot 1 : %f\nRoot 2 : %f",x1,x2);
}
if(d<0)
{
d = ((4*a*c)-pow(b,2))/(2*a);
printf("\nRoot 1 : %f+%fi",((-b)/(2*a)),d);
printf("\nRoot 2 : %f-%fi",((-b)/(2*a)),d);}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Anshul R
Student
India India
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Comments and Discussions

 
GeneralReason for my vote of 2 Can crash too ! Pin
YvesDaoust8-Nov-10 23:27
memberYvesDaoust8-Nov-10 23:27 
Generalthats the most basic rule in the book Pin
JFergulbops8-Nov-10 22:38
memberJFergulbops8-Nov-10 22:38 
General1) It doesn't matter what the real world quadratic equations... Pin
Silic0re098-Nov-10 4:34
memberSilic0re098-Nov-10 4:34 
1) It doesn't matter what the real world quadratic equations say, if I run your program, I have the freedom to (stupidly or not), put a zero where asked for "a". The program should recognize this and ask for a different number, not create a divide by zero exception. One great axiom of programming is to ALWAYS ASSUME your input data is dirty, incorrect, and malicious. You need to protect your program from the user.
GeneralThank you for the suggestion.. I do not wish to be rude. If... Pin
pranav958-Nov-10 0:13
memberpranav958-Nov-10 0:13 
GeneralReason for my vote of 2 Inefficient and does not handle divi... Pin
Andrew Phillips7-Nov-10 15:19
memberAndrew Phillips7-Nov-10 15:19 
GeneralThis is better than the others as you avoid the domain error... Pin
Andrew Phillips7-Nov-10 15:14
memberAndrew Phillips7-Nov-10 15:14 

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