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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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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56 Answers

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

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prog.c: In function 'main':
prog.c:12:14: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1=(-b + sqrt(D))/(2*a);
              ^~~~
prog.c:12:14: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:12:14: note: include '<math.h>' or provide a declaration of 'sqrt'
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Hidden content!
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prog.c: In function 'main':
prog.c:6:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%f%f%f",&a,&b,&c);
     ^~~~~
prog.c:6:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:6:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:12:9: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
         ^~~~~~
prog.c:12:9: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:12:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:17:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
         ^~~~~~
prog.c:17:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:23:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
         ^~~~~~
prog.c:23:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:8:12: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1=(-b+sqrt(D))/(2*a);
            ^~~~
prog.c:8:12: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:8:12: note: include '<math.h>' or provide a declaration of 'sqrt'
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main()
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}
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#include <stdio.h>
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#include <math.h>

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}
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#include ** * *** ******
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int main(void)
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prog.c: In function 'main':
prog.c:10:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
         x1=(-b+sqrt(D))/(2*a);
                ^~~~
prog.c:10:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:10:16: note: include '<math.h>' or provide a declaration of 'sqrt'
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Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
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Case 1: Correct output
Case 2: Wrong output
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prog.c: In function 'main':
prog.c:21:5: error: expected ';' before '{' token
     {
     ^
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Hidden content!
#include  ****  ***** 
#include   *  ***  *** 

int main()
{
* *   **  *  * ** *  * *  a, b, c, *   ** *   x1,x2, realPart, ** ** ** 


* ***  *** *   * *  *** ***  * * *    *  * %lf    * *   ***** &b, &c);


****  ** *  *****  * ******        = b*b-4*a*c;

  *  ** ** **      ****  ** ** condition for real and different roots


 *     *    *  ** *  ** *  **    ** * * for real and equal roots
* ****   *      *   ***     * *   *** (determinant == 0)
* ** ** ***** *    *  *    
*  ** * * *  ** **  ** ***  *  **** *   **     ** *  = x2 = -b/(2*a);
 * * ****  * ** * *   ****  *** *  ** * ** * * *  *     * * *  **  *  **  of %.2fx^2 + %.2fx + %.2f = 0 are real and  * ** * *   a,b,c);
   *   ****   ***         ***     * **   *  *** *** ** * *   ** ****    * = x2 = *******   x1);
 *   ** *    **  **** *

** ***** *  * * ***  *   *  **  * **  if (determinant > 0)
* ** *   * * ***  *  ** *** * 
  **** *    **    * *  * sqrt() function returns square root
***** * * **** ***  *  * *** **  *  **   *  *** * *   *  *** = *  *******  **   * 
**** ***  *   ***   *    *   * * ***  ** *  ** ******     *    * =   ***** ****   * *

   **  **    *   * * ** **** *      ** *** *** *      *  *   ***** of %.2fx^2 + %.2fx + %.2f = 0 are real and **   *  *****  ***
*   *  * *   *  *   * ** * * **   * ** * **** * ***** *  ***** * * =   *** * *  x1);
* ** ***  * *  * *  *    ** ** **     **** * ***  *** *   * *   =  ****   * * x2);
* * **** **    *    **     *   **  if roots are not real
    ** * ** ***  ** **  *
 * * *   *  * ****      *   *
*   ** *  * ****  *   *   *  * * **** ** * **  **   ** ***** = -b/(2*a);
 ***  ***    *   *   * **     * **  *   * ** *  **      ***   ** = **  **  **  *
** **  **  * *  ** ***     * **      *      *  **   ***  *    *   *  *     of %.2fx^2 + %.2fx + %.2f = 0 are complex and * ** *   *   a,b,c);
**   * * * * **   * *     ****     ** ****     *    ** *    ***** * = *  *** **  *  *** realPart, ******** * *
 *** *****  ****     **    ****  *   ** *  **  ** *    *  *  * * *  = ** ***     * *  realPart,   *   
 *** ** **** * *  ** ** * * * *  

* **   ***    *       ******  *** 0;
}
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