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>

int main(void)
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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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 *   **    *  *    ***   * ** * *****  *   * *    *  * ** **     *** **   *  * * * **   ** * *  *  * ****** *  **    **   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)
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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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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