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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#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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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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