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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
*  ** **   ***  * * **   ** *** a, b, c, D, spD, x1, x2;
    
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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)
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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