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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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 ****      **  * * *** * **  *  ****  **** ** *     *   ** *****    *** **** **** (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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