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)
ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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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}
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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)
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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