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# A simple program to solve quadratic equations with

, 8 Nov 2010 CPOL
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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);}```

## License

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

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## Comments and Discussions

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 You have missed one VISWESWARAN199814-Jun-16 20:18 VISWESWARAN1998 14-Jun-16 20:18
 Reason for my vote of 2 Can crash too ! YvesDaoust8-Nov-10 23:27 YvesDaoust 8-Nov-10 23:27
 thats the most basic rule in the book JFergulbops8-Nov-10 22:38 JFergulbops 8-Nov-10 22:38
 1) It doesn't matter what the real world quadratic equations... Silic0re098-Nov-10 4:34 Silic0re09 8-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.
 Thank you for the suggestion.. I do not wish to be rude. If... pranav958-Nov-10 0:13 pranav95 8-Nov-10 0:13
 Reason for my vote of 2 Inefficient and does not handle divi... Andrew Phillips7-Nov-10 15:19 Andrew Phillips 7-Nov-10 15:19
 This is better than the others as you avoid the domain error... Andrew Phillips7-Nov-10 15:14 Andrew Phillips 7-Nov-10 15:14
 Last Visit: 31-Dec-99 18:00     Last Update: 27-Aug-16 7:21 Refresh 1

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