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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* ***** *** ***  * * **  **   **   * **    *  **    ** *    ***  ** **   *    *    ** *   (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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-----------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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