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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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)
{
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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)
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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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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