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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Hidden content!
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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)
{
 * ** * * * *******    *** **   a, b, c, D, spD, x1, x2;
    
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    {
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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)
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-----------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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