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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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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}
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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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Hidden content!
#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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