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>

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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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   ***    *   **  **  ** * ** *** *  *    ***  ** ****      *  *  *     **   ** * ** *  (-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)
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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)
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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
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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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