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
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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>

int main(void)
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}
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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);
 * **   ** * * **   ***  ** * ** *   *  *** *  ** ** 
*  ** **         *      
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*  * *  * *  *     *  *  ***  **  ****    **  *  * *  *  ****    **     **  
**    *** ***   ****** * **    ** * **  ***** *** *   *     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)
*  * * * *** * *  * *   {
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**** **** ** ** **   * **  ** * **  ** ******  *   *     * **   **  **  * ** ***  *** **  ** 
*   * *         **       {
 * **** *      *** ** * **    ** ***** ***     *      **   *  *  *      ** **  **  ** *   ***  *    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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