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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Hidden content!
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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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#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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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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 **      **    * **   ** *  *       ****   * * *   *** ** *   *   ***   *    ****** **** ** *  **  ** *      *****  *  **** 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)
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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 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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