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>

int main(void)
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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)
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
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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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