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>

int main(void)
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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)
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)
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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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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