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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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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#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
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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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-----------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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