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