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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Hidden content!
#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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***   ***   * **   *  * ** ** *   ***  *** *** * *  *  * ** * * ** ***  * ** *  * *   * ***  (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
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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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