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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#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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 * *  *     *  ****   ****** *    * ** ****** * **    **  ***  * * ** * *  ** * **  (-b-spD)/(2*a);
  *****    *  * ** * ***   **  ** * *    *** *  * ** *  ** *  * * ***    **    **  **    *  (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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