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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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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}
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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)
{
 ** *         *  ***** * **  a, b, c, D, spD, x1, x2;
    
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    {
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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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