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
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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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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>

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)
{
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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)
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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