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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 * * * * *   **    *  ** *    *   * * *  **      **    ** *** *   * ** **** * (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)
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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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