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

int main(void)
{
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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)
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-----------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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