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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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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#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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 ** *  *   * **  ** *  *  **  *    **   ***  **  ****  *  **     ** **  * (-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)
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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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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