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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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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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)
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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-----------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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