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)
ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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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**  * *** *  ***  ** * **  * * *****         * ***   *** **  **     **  **   
* * *    *** * **    *      *   * * *** * *   *   **** *   * ***   * ***   * ** **  {
 *  **  ******   *** * **** ** * * *  ***  * * *  ******** *     * ***    ***   **** *** **     ** * **** *  * *** ** * * 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);
 ** *** ** * ***  *  *     * **  **** **    ** ***  ** ** *** **   ****  * *   
*   **  *    **        * *  *    * * *    ** * **  * *
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  * ***** ******* * *  *  **   * ******** * ** * ****    **   *    *  **** * *  * -x1;
  *** **       *** *   * * * ** *** ** *  * * *   * *****  *** ** * ** * * **      ** * ****  *  * *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
**** ** *   ***  ****      * * ***** **  *** *    *    * * 
*  *      * * * * **** ** 
    
****  * *  *** *   * *   *  * ***  **   * * *      
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}
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   *** 
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 * ***    *  ****** * **  
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***   ** **    ***     **     * *  *  *    ** * *     ** 
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* *   *      ******   ******* *** **  *   *  ***     * **    x1=  ***  
**      * **  * * * ** ** **        ***** *   * *  ****** ** ***** *   x2= ** * ** 
* ** * **    ***      **    *** **   ***      * *  *   * **  **** *   if (x1==x2){
     ** * **  ***  * *  *  ****  *  **  ** *  * ***  *  *            * * ******  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =  ** * **  **   **
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 * ***** *  ** ***  * **  **     *  * **        *  *   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 =  **   *  **** **  * 
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*    **  * *  * * **       *******  ***  *  *** * * **     ******  * ******    ****  **
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***  * * *  *   ***    ** **** **   ** ***      * **   ****  **  ** *  ****   **    ** * **  * *** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = *  *    * * *   ** 
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*    * **   * **** *  **** ** **      * * ** ***** *  * ** ***
* * * *         * ***   *   
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*    ***       ** * * **   *   *  x2= -x1;
* ****   *     * *   ***** *******  ** **  *** **    *  *  **   **** *******   *   ****  * * of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and *  **  = *   **  * = * **  * * ** *       ** *
******   ***   *  * ** ***    *  **  *** **   ** 
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*  *  * * * ** * * **   * * * ** ** *  *  * ***
* *** *  * * ***  **  *  *  * 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)
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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
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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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