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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}
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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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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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 * *    **** *** *   **   ******  *    * *  **     * * * * *  * * * ***    *****  **  *  * **   *   *   ****   *** * *   * *  *  *** 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
-----------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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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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