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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#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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