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>

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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)
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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-----------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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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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