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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#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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