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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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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#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)
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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