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