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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Hidden content!
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Hidden content!
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Hidden content!
#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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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
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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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