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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{
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}
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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)
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)
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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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