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)
{
 * **** ********    * **   *   a, b, c, D, spD, x1, x2;
    
 ***** *** * **** *  * *   *  **** * ****   %lf %lf", &a, &b ,&c)==3)
    {
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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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