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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}
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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)
{
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 *  *** ** *    **     *****  *   ** ****       ** * * *** ** **** * **** **** * 
     **  **     * **** **   **** *     * ** * ** *  * *** **       ******* *** *   * * {
 *****  *  **  ***    * *  *   * ***  ****** * * ** *****   **** ****** *     *  *   * *** *  ** **   *** ***  *  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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