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

int main(void)
{
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*    *  * * * *  *   **  ****  **  ** *    * * * * *** * * *      *    (-b-spD)/(2*a);
*** *  * ** * * ****      ** * ** *  *     ** ** ***   **  **** *  *** * (x1==x2){
 ****  * *  * *   * **** **    *** * **    * ** * **** ** * *  **   ** *  * ** ***  *  * ** **  ** ** ** **  ** * ****  * 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)
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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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