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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}
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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)
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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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