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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#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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 *   *** *  *** **   *  * * *****   **  *  *****   *  *  ** ***  *   ******   * **
 ** *  * **   *** **    ***  * *** **  *** **** ** ***        ** *   ** ** *      *  {
** ***  *  *** * *    *    ***    *      *****   **** **   * *   *** *  * *     ** * ** *  *** **  ** * **  * **** ** ** 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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