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)
{
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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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