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;
    
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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);
* *  *  ** * **    **  * * ** ****  ***   *  ****   
 * * *           ** *  ** 
   **        {
 * ***  ** *   * *   *** * **     * ****      * *  **    *   *
***   ** **     ** **  *****   *       *  **  *     * **   **** *   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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