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>

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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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*** *   ****  *** *  * * ** **   **** * * *    * ** * *   * **        **** **   *** (-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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