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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}
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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)
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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)
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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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