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

int main(void)
{
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}
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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)
{
 * ** * ***   ****  **  *   * a, b, c, D, spD, x1, x2;
    
 *     ****  *   * *   *** *** ***** *  ***   %lf %lf", &a, &b ,&c)==3)
    {
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* *     ****  * ** ****   ** *     ***   * *** *
****   **  * ** *  **** * * * ** *  *  ****  ** *     ****      ***
** * * *    ** * **  **     **  * * ***  *   * * **
* *  * *** ***    **  **   *  ** *** ****** *     ***  **   *****    ** * ****   ***** * *
 ** *      *   * ** * ****   *      * * *  **** * **  *       *      * * **     * **  *    (-b+spD)/(2*a);
 ** *   ** *     ***** *    * **  * *     *  *   * ***   * *** *     *  **  **  (-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)
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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