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
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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
-----------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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