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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#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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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)
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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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