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>

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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)
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-----------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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