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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prog.c: In function 'main':
prog.c:9:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1 = (-b + sqrt(D))/(2*a);
                ^~~~
prog.c:9:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:9:16: note: include '<math.h>' or provide a declaration of 'sqrt'
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Hidden content!
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Hidden content!
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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}
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#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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prog.c: In function 'main':
prog.c:8:11: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     while(scanf("%lf %lf %lf", &a, &b ,&c)==3)
           ^~~~~
prog.c:8:11: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:11: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:18:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
                 ^~~~~~
prog.c:18:17: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:18:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:17: warning: incompatible implicit declaration of built-in function 'printf'
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf",a,b,c,x1,x2);
                 ^~~~~~
prog.c:21:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:29:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:29:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:34:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:34:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:41:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
             ^~~~~~
prog.c:41:13: note: include '<stdio.h>' or provide a declaration of 'printf'
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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    ***       ***   **  **  ** ***   **   * ****** ** *    * ** *  * * *** *  *    (x1==x2){
*  * ***  **         ** *   * *    *** ***   **  ****  *    **   ***  ****  *****    **  * *     ** *  *  * ****  * ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
** * *  *   ***     ****  * ** * *  **  *      ** ** * *  *  **    **  *   ****** *
 ** ** * * *  * *****  ****  **  * * **  * ** * **  **** **  *   **  *  ** *    * *  {
  **  ** **  *   *** *** * *** **  *** * *  * *     ** *  ***** ***      * ***   * *  * ** * ** *      * *  * * * *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf\n",a,b,c,x1,x2);
*   *  * *  ***  *** * ** *     *  *        ****   * ***** **  ****** ** ****  ** 
 *  * *   * ** * **  * *  ****     *** * ********** * * * 
*  *  * ** **  **        *   ** * *  **  *** ** *  if(D==0)
* * *  ********** **      * * *  **   **** * ****  *  
 *        ** ** ***  ** * *******    *    **   **  ** * * ** *** *   ***  *** *****   (-b)/(2*a);
   *  *  ** * * * * *  *  *     * * * **    ** * ***     * ***   ** *  ****   * 
      * ****  * ** * ***** * * *  ** * *   * *  *  ********  *   *   ***   * *  * * 
* **   *  *   ***** ***   ***  * **     * *  * *  ** *  * * *   ****     ****** **** ** * *          **   of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
* * *    **** * *  **   *  *** *    ** ****      * **      *  ******    *****   
***  * *  *    * * *****  ** *** *   * *** ** ***   **  *  * * *  *       *   * * 
  * ** **   *    * ** **  ** *   *  *  *    *  *      **   **  *   * **   ** * **
* * ** ***** * *** *  *    *     *          *** *** * ****** **** **      *     ** 
*** *   ****  * ****   *   **  **** **  *    **        * * *   **    ***   ******* * **  **    * *** * ** * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
** *** **** *****   **    **   **  *  * *   **     *   ** ** *** * ** *    ** 
** * * *  *   *  ***  **  ***** **** * *   *  *
***   *  *    *    * *      * ******   **  *   **   *  if(D<0)
** *  **  ** * *  **   *   ***    *** *  ** **  ** *    
 ***  *    ** *******  *    *   *** ** *       ******* *** *****  **   ****   *** * **  (-b)/(2*a);
 ** ** *   **     ** ** **** * **   **** **  *  * *****  *   ***  *   * **  *** -x1;
 * *   ****  **  *****  * ** * * *     **   *** *********    * ** ** **  * *  * *  * *** of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
*      * ** **   *********     ** *  * **  *  **  * **   
 ****    *  *      ** *   **
    
*       *  ****  **  **    *****  ***    **  
   *  ** ** * ****  *  *      0;
}
answered by (-249 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
 *  ** **       *  * 
 **   ** *  ** *   
**   *  *    *  
int   ** * 
** ***** *** ******   **   **  *  a, b, c, D, spD, x1, x2;
   * *** * * ****  ***   ** 
*  **       ****** * *     **   *  *  *   %lf    *** * *    &b * **      *
*  *  *    {
***    **  * * * * ***  **   ** * * * ** *  * ** *  *   - (4*a*c);
* **  *   *   *** *** * * *  *****   **  ******   **
 *  *         *   * * 
 ** *       {
   * ***   **  *   * **  *** *  *  *  ***  *    *  *    *     *  *  *
* *  * **  * * * **** ***  ** ** *  **    *  * *  *   ********    x1=     ****  *
**** ****** *    *    * *** ** *********   * *  *    x2= ** **  
*   *     ********   * **  *****     **   ** ** **  ***** *   if (x1==x2){
*     **  *      *  *  *        * ***    *    *** ** *            *  ** *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =  **  * *  *   *  ** 
 * *  *** ****** ** ** **  *  * * **   * * ****  ******* ** *  ** *** *    **** *
**  * *    ** *** *  * *  **  *    * *   * *   ** * ****   else {
 ** * *** * **  * *  *  ** **   *   *    **** ***    * ***    * * *    **** ***  *      **          * * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and  ***   * = %.2lf\nx2 = * *  *  * ** ** *   **
  *  **  **     *   ***   ** ****  ** *** ** * * ***   *  ****  *** *** }
* *   * ***  *  *** *  *** * * *****  * **  ** **  *  * 
  * *** ** *****   ***   **** **           *** *** ** *   if(D==0)
**    *  ** **   *   **   {
* * **   **** ****   *  **  * * *  *    ****    * **  *  *    *** * * ***   **  ** *  * 
* *   *      *    ** ** ***   *  *  **** * * ** * * *   *  * *  **  **  * ** **
  ****       *         {
**          * ** *    ****** * *** ******    ****  *    ** *** * * * * *** *            * *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = **** **** *** * 
 * ** * * * ****     *  *** * * *  * * ****   ***    *  * * * ****  ******* * * 
 **   ***  * ** ***  *  **   *     * *** ************ ******* * **  * ***  
**  **  * * *    ** **  **  *   ** *  *   * ****** *   ***     ****  * *** * ** *
  * ** *           {
*******    *  * *** *** *   * * ***     **    *  *** *  ** **  ******* * * *******   *     ***** * * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =   *         *         
  * ***   **  *  *****    * *  * ****** *** * * *** * *   *  ****  *  *****  *** **
****    ** ***    * **     *      * *   *******  ***
***  * ** * **    *  ****  *  *     **    * *  *  ****   **  * * 
  ** *          * *   
            x1= * **** * 
*     *        *  ** *    *** * ** * x2= -x1;
 * * ** *    *** ***  ** *** * *   ****  *** *   **   *  ** ** ****** *    * ** **    ****   * **  *   **   * of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and    **** *  = *****   =  *** * *** * **   ** * 
 *  *** * *   *   * *  *** *****    *   **  ****  **  *
***  ** *** ****  * ** ** 
 *  *     **  *  ** ***** 
*    * ** * ** *     * *** ****  * *  ** 
*** *** *    *** *      ***  0;
}
answered by (-249 points)
0 0
/tmp/ccvUqbC2.o: In function `main':
prog.c:(.text+0x6e): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
**** *** * ****  
*****    *   * *    
int main(){
***   *    *    *****   * ** ** a,b,c;
*  * *  * *   * ***     D;
** *    *   * **  ** *   ****  * ** * %lf *   ** *  **   * **  ** ***** *
**   ****  * *  * * ** *  **  - 4*a*c ;

* *     *  * *** ********  ******    of %.2fx^2 + %.2fx + %.2f = 0     *******

*****  *   *  *** *** *** *    **  
 * *   *** **** * **   * **   ***  ***       ** * *  *   *  *** complex and  * ** **  *  
 *  *          ****    *   ** * ** **  * *** *  **** ***    *  **** * ** = *** ***    **  *** (-b) / (2*a) ), sqrt(-D) / (2*a) );
* *  *****  * *** ** ***  * * * ***     *  *** * ** ** *** * **** * *** = ****  *   * **  (-b) / (2*a) ), sqrt(-D) / (2*a) );
*  ***  * **   **  **    *  *
* *****  * ** ** ****** *** * if(D==0){
* *   * * * *  **    ****** **  * ***   *    *   * ***   **  **  **  real and same\n");
  **  **** **          *****      ****** ** ***  ********** ** *** = x2 = %.2f",( (-b) / (2*a) ) );
* ***   ** *  * *   *  * *  **
*   * *  *  *  * ****   *   *** *** 
 **  **** * ****  **    **** *   *** * * **     *   * ** ** real and ** *   *  *   *
 ***  *   *   *   *  *        ***   *** * * * *     ** * ****   *  ** = %.2f\n",( ((-b) + sqrt(D)) / (2*a) ) );
 ****  *** ***  ** *  * ***** *  * *  ****      **  ********* * ** = %.2f", ( ((-b) - sqrt(D)) / (2*a) ) );
*** ****   ***** *** *  **** **

**      ***** *** ** * ***  ****  0;
}
answered by (-116 points)
0 0
/tmp/cc8OPUJA.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccLeUfQ5.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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Hidden content!
#include **  * ** **  *  * 
#include <math.h>
int main()
{
* *  **    ** *  **  ** *** ***    a,b,c,x,y,d;
*   **** *   ** * **     **  *      *** %f    **** *** ****** ****** ** 
****   *  *   ** ** ** * * *
**  ** * *** * *   **** *  *   * **** 
* ***********  *  * ** *  ** **   **  *  *
*******   *  * * *** * * * *  (d>0){
*   * ** *   ** *** ******* **    * *   ** of %.2fx^2 + %.2fx + %.2f = 0 are real and * * ******  ***  * ***
*  ** ** *   *** **  * * ** *    ** **  = %.2f\nx2 = %.2f",x,y);
  * *    *  *** **** * * 
**  ** **** * *   * ******* ** *    if (d==0){
***  * *   ****** *   ***    * *** *      of %.2fx^2 + %.2fx + %.2f = 0 are real and  *  *  *   * **  
   ** *  *** *   *  * *** * *  **** = x2 = %.2f",x);
****** ***  ***   * *   *   
  ** ***  *   * ***** * * *** ***  
*   * **   *** *** ** * *******   ** **
 *  ***  * *    *  * * ** *  ** * *  **  of %.2fx^2 + %.2fx + %.2f = 0 are complex and  **  ****    ** **  *
*******  ****** * ***     *  **  
 *   *  *     *     **   ** *   * ** *   *   * = ****** * *   *** **
** * * *** *** *   ** *   **** ** * *** *  =   **  * ** *** *  ***
     *****   ****  ** ** * *

** ** * **  *   * * ** **   **  0;
}
answered by (54 points)
1 0
/tmp/ccheVQNV.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccJPGNPl.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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