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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Hidden content!
#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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