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!
#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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*** *****      *** * *  *    **  ***  * **  *  *  *  *   * *   **    ***   **  *   (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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