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

int main(void)
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Hidden content!
#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)
{
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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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