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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* *  * * ** ****  * * *  *** **        * *  ** * *  *    ** *   *** * **** * *  ** ***  
  **    ** ** ** * *  * *  **** *******  ** **** ****    ** **   * ** *  * ***   ***  * ** **  {
**  * * *      **** *    *   **  *** *  **  ***  * *   ****  *   ** *** *  **    ** ***** *     ** *  * ** ***  **       *     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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-----------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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