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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ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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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}
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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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