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>

int main(void)
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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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#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)
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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