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

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}
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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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*** * * *** ** *  * *** * * * *****  **  ** **  *** *  *** ****** ** *     *   *  ** (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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