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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#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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}
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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 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 =   *  * *   *  *******
* **  **  *  * * ** * * *  *  *  *** *  *   *    * *** ** *    *    *     *****
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 **** **            {
    **  ** **   * *      **   *    **    *  *  ** * *    ** *****  * * * * *** **  ** * ** *  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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