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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Hidden content!
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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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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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    *  * ** ***  * *** * ***     **  *  ***  * *****    **   * **  * * *   ** *** ***   *  ** ** * *********   *** ** 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
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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
-----------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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