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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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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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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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)
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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