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)
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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