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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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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#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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* *** * *  ** * * * *  *   *** ***  * ** **  *   *     *** ***** *   * **** ****   * *****  * * **** *  *  ***  * * 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)
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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