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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56 Answers

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Hidden content!
#include <stdio.h>
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Hidden content!
#include <stdio.h>
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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>
#include <stdlib.h>
#include <math.h>

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