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>

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}
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#include<stdlib.h>
#include<math.h>

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