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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}
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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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#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)
{
******  **  * ******   **  ** **  a, b, c, D, spD, x1, x2;
    
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*****   ******  * *** **  **    ****   ***  *  ** * ** ***  *****     ****  * **** *  (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)
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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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