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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#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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*      ***    * *****  *   **  *    ******  **  * ***   **  **  *** **  **  * *   ** *    **  *  *        *   *** *  *****   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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-----------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)
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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 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
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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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