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)
{
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 * ** ***  ** * ****   ******** **** *    **  *    *  * **  ** *      **  * ** (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)
0 0
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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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