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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#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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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)
{
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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)
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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