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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