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

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

int main(void)
{
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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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