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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}
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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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#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)
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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#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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