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>

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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 * * * **   **  * * *   * ** ** ***      **     * ***   * * ** * ****  *   ****** (-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)
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-----------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
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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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