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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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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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#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)
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
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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 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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