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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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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Hidden content!
#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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**         * ** ****    *   *  *****     *  ** * *  * * ** ** *   * ****   **  *    (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)
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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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