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)
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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