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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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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}
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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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Hidden content!
#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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