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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Hidden content!
#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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  **  ****    **  *  ****  * **  * *  *      *   ****   **   * *    ****  ***** * *   (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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