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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}
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#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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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*********  *   **  * ** *  *****    ** * *** * * *    * ******  * * ***** * *** *  **** *****  *    ** *  *  * **** ****** 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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