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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*   **  ********  **     * * ** ** ***     ** **   ****  **   *** ***  ** ** *   * * (-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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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 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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