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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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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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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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)
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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