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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Hidden content!
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Hidden content!
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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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   * ***** * *    ** ****  **** * *****  ***  *    *** * *** *  *     **** * *   ** (-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)
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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