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)
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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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Hidden content!
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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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#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)
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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)
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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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