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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#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)
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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)
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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 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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#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
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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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