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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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)
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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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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