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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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)
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)
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-----------Re-judge-----------
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
-----------Re-judge-----------
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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