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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Hidden content!
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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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Hidden content!
#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)
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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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