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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