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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#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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 **  **        ** ** **     ** *   **  ** ***   * *  *  * *** * **   *  *      *  *** *  *     (-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)
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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
-----------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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