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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#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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**        *   *** ****  *  * ***  * *  * **** *       * *  *  *  ** * ** * **   * *** (-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)
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)
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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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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