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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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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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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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**  **  **  *  **   *** ******* ***  **** ** **   * ** *  * ****  *** **  * **  **  **  * *** * * * * * ** ** ***    * 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 = ***   * **  * * *** * 
**  *  * *   * **     * *   **** * ** * ********** *** ** ***    * *** }
     ** ******* * **  *  ** * * ***** * ** * *   ***  **    
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*    * ** * * **  *    *    {
* *** *  *** ***** **      * *** ** ** *  ** ** *** *  *  * *      *    ******** ***   *    
      ** * **** **** * *   * ****  ** ***   ** *    ***  * * *  **    *  *     
     **      *        {
* ****   ***** **   ****  *     * **** **     * *** *  ** ** * ***   ***  * *   ** *  * *  ** ** *  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)
0 0
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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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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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