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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}
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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)
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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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