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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ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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)
{
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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)
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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 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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