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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#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)
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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