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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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* ***   * ** * * *     ** **       * *    ****  **** **  *  ** * *******     *    ** (-b-spD)/(2*a);
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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)
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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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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