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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#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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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* **      * *   ** * **** *   *   ** *  ** * **      *  * ** *  *  * *  * *  * *  **   (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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