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)
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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)
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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