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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Hidden content!
#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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#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)
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-----------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)
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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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