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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#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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 **   *   * * ***    ***** ****  * *** *** * ** *   * **  * ** *** ** ***      (-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)
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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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