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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#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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***** ** *   **    ** ******  *    ******* *****    *   ***  *** ** * *  *  * (-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)
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)
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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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