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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}
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#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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#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)
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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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#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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