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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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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**    *    ** *   * * * *** *   ****   ** **   **  *   ** * * * ***   *   * ** *  (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)
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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