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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ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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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int main(void)
{
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}
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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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}
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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)
{
 ***** ****    * **  *     **  a, b, c, D, spD, x1, x2;
    
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   **  *   *** **  * *  *   *    ** **** * **   * **   **** *  **  *   **  *** 
  ***   * *  ******* *   ***   ** **   * ****    *   *** ***  *  *** * *   * {
**    ***   *      *  *  ** **** **** **  *   ** ** **       ****    *   *    *  * *  *     ******  ** * *  ***     *** 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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