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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Hidden content!
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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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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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  **  *   * **     ****            * **********    ***   * *** ***** **       * *** * (-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)
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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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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