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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}
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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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}
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Hidden content!
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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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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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    {
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 ******   * * ***       ** ** ** *  * * *** **    **      *  
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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
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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 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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