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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** *   * ** **    ** *  *  *  ** *  ****    *   * ** ***    *   * * *   **   *    (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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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
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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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