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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#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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 ** *      **   ** ** ** *  *   ***    ***** ****  *     *  * ** *  **  *    **** ** (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
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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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