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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Hidden content!
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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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}
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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)
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
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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)
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Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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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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