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

int main(void)
{
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   *** *   ******** *     **   **   ***  ** *     ******     *    ** *  (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)
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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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