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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Hidden content!
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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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Hidden content!
#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)
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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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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