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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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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
** *  **   * * *  * **   * ***  * ** a, b, c, D, spD, x1, x2;
    
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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)
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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