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>
#include <stdlib.h>

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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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#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
Case 2: Wrong output
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Case 1: Correct output
Case 2: Wrong output
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Case 0: Correct output
Case 1: Correct output
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prog.c: In function 'main':
prog.c:21:5: error: expected ';' before '{' token
     {
     ^
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Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output
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Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
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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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Case 3: Correct output
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