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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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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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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-----------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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