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>

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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** * * ** ** ** * **** ******** ****  * * * *   *  ** ****** *     * * *  *  (-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 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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#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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