10-26 Exercise 3: Find roots of a quadratic equation

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Write a program to find roots of a quadratic equation

A quadratic equation is a second order equation having a single variable. Any quadratic equation can be represented as where a, b and c are constants ( a can't be 0) and x is unknown variable. 

寫一個找二次方程的求根程式

For Example

 is a quadratic equation where a, b and c are 2, 5 and 3 respectively.

To calculate the roots of quadratic equation we can use below formula. There are two solutions of a quadratic equation.

使用下列公式:

x = (-b + sqrt(D))/(2*a)
x = (-b - sqrt(D))/(2*a)

where, D = (b*b-4*a*c) is Discriminant (判別式), which differentiate the nature of the roots of quadratic equation.

For the complex result (複數根):

realPart = -b/(2*a);
imaginaryPart =sqrt(-D)/(2*a);

Note: We have used sqrt() function to find square root which is in math.h library.

 

Example input 1:

1 2 1

Example output 1:

Roots of 1.00x^2 + 2.00x + 1.00 = 0 are real and same
x1 = x2 = -1.00

 

Example input 2:

1 -3 2

Example output 2:

Roots of 1.00x^2 + -3.00x + 2.00 = 0 are real and different
x1 = 2.00
x2 = 1.00

 

Example input 3:

1 2 2

Example output 3:

Roots of 1.00x^2 + 2.00x + 2.00 = 0 are complex and different
x1 = -1.00+1.00i
x2 = -1.00-1.00i
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Everything is fixed. Enjoy your time with The Judge :)
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ANNNNNNNNNNNNNNNNNNNNNNNNNNGRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
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Your code has newline at the end sometime. You learned this lesson many times!
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After i correct the newline in my code,there is still wrong output.However,I had run the program in Codeblocks.The output is still as well as the result. Seeking for help.
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your output lack of 1 space at line 8 when print out "Roots of ...". Please be careful with all small details when working with online judge
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#include <stdio.h>
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#include <stdio.h>
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#include <stdio.h>
#include <stdlib.h>

int main()

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prog.c: In function 'main':
prog.c:12:14: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1=(-b + sqrt(D))/(2*a);
              ^~~~
prog.c:12:14: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:12:14: note: include '<math.h>' or provide a declaration of 'sqrt'
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Hidden content!
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prog.c: In function 'main':
prog.c:6:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%f%f%f",&a,&b,&c);
     ^~~~~
prog.c:6:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:6:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:12:9: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
         ^~~~~~
prog.c:12:9: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:12:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:17:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
         ^~~~~~
prog.c:17:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:23:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
         ^~~~~~
prog.c:23:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:8:12: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1=(-b+sqrt(D))/(2*a);
            ^~~~
prog.c:8:12: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:8:12: note: include '<math.h>' or provide a declaration of 'sqrt'
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main()
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#include <stdio.h>
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int main()

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#include  *   * * **   
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int main(void)
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prog.c: In function 'main':
prog.c:10:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
         x1=(-b+sqrt(D))/(2*a);
                ^~~~
prog.c:10:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:10:16: note: include '<math.h>' or provide a declaration of 'sqrt'
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Case 1: Wrong output
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Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output
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prog.c: In function 'main':
prog.c:21:5: error: expected ';' before '{' token
     {
     ^
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Hidden content!
#include ** * **  **** *
#include  ** ****** * **

int main()
{
**    ****** **   * *  ** *     * a, b, c,   **  x1,x2, realPart,  ** ***   


 ***** *  **  *** *     *   ** * *  * %lf ** **             &b, &c);


 *  * * *    *** *   ***** **   **  = b*b-4*a*c;

****** ******* * ******   **  condition for real and different roots


*** *       * **** ******   * *     ** for real and equal roots
*   ** ***** ** **     *    *  * * (determinant == 0)
  ** **** * **** * * ****    
**   *        * *    * ***   *  * * ***  ********  ** = x2 = -b/(2*a);
  **   ** * **     **    ***      ** *** * ***   *   ***    * *    * ** of %.2fx^2 + %.2fx + %.2f = 0 are real and * *  * *  *   a,b,c);
**    *    * * * * *** ** *** *    * **  * *****  *****   * **   = x2 =  *    * ** x1);
 ***   ** ** ** ****  * *  * *

*    ***  *  *****    ***     * *  *** **  if (determinant > 0)
   **  ***** ***  *    *
****** ** *  *  ****  **   * sqrt() function returns square root
*   ** *   *       * * *** * *****   *  * = * *  * ** ** *** **
**  * ** **   *** ****** **  * * ** * **   **   *   *   =  * **  *  **  *  * * 

 **** *  ***  * * ***  ** **  **** * **  * ***  **  *  * * *     ** *    of %.2fx^2 + %.2fx + %.2f = 0 are real and * *     ****** *
    **** ***** ** * *** *   * ***** *    ** ****   * * *  ***    ** =  **  ***   x1);
****** ***   **  * ** * * **** ****    **  *** *    **** **  =  *  *  ***   x2);
****    *  * ****  * **   **  if roots are not real
   ** ** *******  ****   *
* * *  *    *   *** ***  ** 
**   *   **      *  * *  ** **  *   * *   *  ** * ** * = -b/(2*a);
   * * **** *  ***   *** *** ****** *  ** **    *       *** * *** = * ** ****** 
 ***    ** ***** *  *****   *** ** * *   ** *  ****** *   * **   * **  of %.2fx^2 + %.2fx + %.2f = 0 are complex and ** ***  *** *  a,b,c);
 **   * **  * ****  ** *  *  ** **  **  * *** ******    *** ******  ** =    **** ***    *  realPart,     ** **  *
 * ** *** ** **     *  **** *  * *  ** * **** **    ***** *   ** *   =  ** * *  *  * realPart,   * *  ***
  *  * **** *  * *  *** *  

**     *  *** *   * * ** *  **   0;
}
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