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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Hidden content!
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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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Hidden content!
#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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**   *****   *** *** ***********  *** **  * * ** * *  ** *   * *    ****  *   (-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)
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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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