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

int main(void)
{
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}
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#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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****  **** *** *   * *  *  *   ***  **      *** 
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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);
  * *  ** **  *  *   ****  **  **   * **  **    *  * 
 *             * ***** 
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* ** ** *  * ***  * * **      *  **** *** * ** * ** *** *       *   **   *
* * ** *    *    *  * **** **    * ****  * **  *   **    * *      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)
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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)
0 0
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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
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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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