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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#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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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)
0 0
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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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