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)
{
*  ** ** **     * *     *   ** a, b, c, D, spD, x1, x2;
    
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  *  *   *  *   ***  *   *  **   *  ***   ** **   * *  *** ***   ** *  * ******   * **   **  *  *   **   *  **  * * 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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