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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{
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}
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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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}
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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)
{
**     ** ****      * *  * ** a, b, c, D, spD, x1, x2;
    
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    {
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 ***  ****  ***   **  *  ****  *  * ** ** 
 *** *  *   ***** * *  *       ** ** *  **** *  **   **  *** 
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 **  **  **  * *   * **  * * *   * **  ***** *  *  **  * **     * ** *    **      
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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)
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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