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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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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*** * **     * *    *   *  * * ***  **   ******   ***     ***     *** *   ** **   ** * (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
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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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