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)
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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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