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)
{
* ** * *** * *  * *  *   ***   a, b, c, D, spD, x1, x2;
    
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*  * * ** ***  ** *** *******  ******   *  * *  ** * ** * **  **    *  * *           ** **   (-b+spD)/(2*a);
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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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-----------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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