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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}
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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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}
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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)
{
** * * *    **    ** *  ** * ** *** a, b, c, D, spD, x1, x2;
    
 ****  * * ** *  ****  ** *   * ***** ** %lf %lf", &a, &b ,&c)==3)
    {
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** *    **   *   **** ** * *  *  ** *****      * ** *****   
* *********** * ************ **  *  ***** ** ** * * *** **       
 ****   *****     ** ** *  ***  **  *   **  * ***   ***
**** *      ****    **  * * **  *** * ** ** **   * * ***    *    * ***     *  **   **  **** *
**  * * * ****  * * **        ***   * **      *  ***    ** *** ***   ** * *  ** * ** (-b+spD)/(2*a);
 ***  ***   *  ***    *** *   **   *  * ** * ** * * * **   * ** **   * ** (-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)
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-----------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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