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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#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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