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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}
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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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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)
{
* *   *     *** * **  * * a, b, c, D, spD, x1, x2;
    
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    {
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  *  **** *     **** ** **   ***    *  * ***** ** **   *   ***  *   
** * *****  ***     ** * *    ****  *****  *  *   *
*   **         * ** * *   ** * **     ** **** * **   **  ****** *   * ** * ***  * **** *  **
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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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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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