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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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** * **    ***   * *** *    * *   ****      *   * **  
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 **    **  *   **** *  **   * *   *********    *******  *  ** * *   **** **  *   *  **  (-b+spD)/(2*a);
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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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