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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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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  ****  **   ***   * ** ** *** ** *  ******* *    **    **** * **    ** *   *   * ***** (-b-spD)/(2*a);
**    ***   * *** *         **  * * **   * ** ***     *    ****** ** ** *     (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)
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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)
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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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