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)
{
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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)
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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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