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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#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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    *************  *  ***     * * **  ** *  ** * * *    **    ** ** *   **   ** **  (-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
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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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