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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{
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}
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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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 *** * **  ** * *** **   *   * * * *    *  *    * ****** * * **   *** *     *  * * 
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*   **** * **  * * ** **** **  *** * * *   **** * *** **   ** *    ***** ***   *  **   * *  (-b-spD)/(2*a);
   * *   ** *    ***       * **   ******* *****  * *   *  **    **  * *  *    **     (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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-----------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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