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)
{
 *  * * **  * ** * **  ** a, b, c, D, spD, x1, x2;
    
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    {
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****  ****** ******* *   ******* **** *** ****  * *   * *
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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 =  *  * **   *   * 
 *   * * *   *   ** * *  * *   * ** **   * **  * * *   **  * * *    }
  **   * ** * * *   ******  *    *       **** ****  ** * 
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*  * *  *** **  * **      * ***     *** ************   ***    * ***  *   *   ** ***   ** **  
*  * *  * *  *  **   *****        * *   **   *  * *  *  *    ** * ** * **     **   ** 
  *   *   *  **       {
*   * **  *******  ** ** **** *   *** * ** * **   **    *   *    *      * ** **   *    *  *** *   of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =   * *   * *       *
*   * ** ***  *    **   **  *       **  ** *  ***   ****  *    *  *  *     ** * 
     * * ** ** ****   * *** *  *** ** ** * *        * ** **   *** * ** ***  *
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* ***  *            {
*   * ********     * * * *  *   *   * *  *   *   * ** **  * *** *  *** *  * ****  **  * *  **  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)
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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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