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>

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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)
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)
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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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