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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We will continue this question in few days
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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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Hidden content!
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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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}
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>

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}
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#include   ** * **  * *
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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'
commented by (4.3k points)
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Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
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Case 1: Correct output
Case 2: Wrong output
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Case 1: Correct output
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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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Case 0: Correct output
Case 1: Correct output
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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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