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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}
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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);
**    * * ** **** ** * **  *    * **** * * *  *         *  **  ** * ***  **** ** ***    (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
-----------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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