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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#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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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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-----------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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