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)
0 0
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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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