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>

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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)
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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
-----------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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