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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}
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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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#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);
 *   * *   * **  ** * * ***   **   ***        *
**** *         * ***     
 **  ** **        {
  ***  * *     **  *  ***  **  ** ** ** **  * *   * **  * * *     **  
** *  **   ** **** ** *  * * ***   * *    ** ** *  *  * *  **   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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