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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}
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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)
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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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