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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}
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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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    {
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**** ******    **  **      **** ** **  **  * * *
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******  *   ***  ***    * *  *** ** **  * * *** ***  *   *** **  *  **  ** *****
* *** * * *  * *****  * ** *  ***   **** * **  *** *   ******    *  *    * *     * *  (-b+spD)/(2*a);
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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
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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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