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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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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)
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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