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

int main(void)
{
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* *   ****  ***  **  ** **   *   ***** ** ****   * *     *  ******  **  ***  * (-b-spD)/(2*a);
**   ***   * *  ***  *  *** * **    ***** *    *  *****  *****  *  **  *  **   *  ** (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)
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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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***  * *  ** * *   **
* *  *  *** *   *  **
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 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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