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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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>

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

int main(void)
{
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**  ****  *     * * * ** ** * **    * * *** *   **  *  ** *   **  *  * ***** * * * *****   (-b-spD)/(2*a);
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*  * *    *****  * **     *** ** *  *  * ** ** *****  ** *  ****  **** **    *** * *  *  ***  *    **** * *   * *    **** 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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