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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Hidden content!
#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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