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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#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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Hidden content!
#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)
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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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