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

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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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 *  **  **    ***  ** **  * *  * *** *    * ******     *   *  ****      *  ** **  *      *   * * ** *  ****   *  * *    ** 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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-----------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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-----------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: 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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