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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 ***** * * *   *** **    **  **    * **  ** * *   **  * *   * ******   ** * ** ** * ** (-b-spD)/(2*a);
* *** ***   ***** ****  * *** ***  *** *  *  *** *   **  **   *   *   ** ** *  ** *  *  ** (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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