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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#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 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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#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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