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

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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)
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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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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