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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#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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 *** **** **    * * *    *  * * ** *  * * **** *** * * **** *** **   ****   ***    
  *   *  ******* ** *** ** * *   *  **  ****** *   * * *  **  * *** * ******   {
* * * *  *   **** ** *** **  ** * * *  *   *  ****   ***** * *** ** *     *  **  *** * *** *** * *   * *  *  *  * 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
-----------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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