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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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>

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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 * **    * *  * * * * **   *** ** * * *   *  *   * **   *         *****  **  ***  **  **  *   *** *** **    ** ** *  ***  **** *** 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)
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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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