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
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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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** ** *  **  ** * *  ** ** * * * ** *   **   *****  * * *  ***** ***** *  * **  ** * *  (-b-spD)/(2*a);
 ***  **     * **  ** ** ****  ***     *   *****  ** ***** * **   * ******   * *    ** * (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
-----------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: 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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