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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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>

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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