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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#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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 ** *  ** * * **** ** ** **  **     ***  * ******       ** *     * **   ** *  **  **  ** (-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)
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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 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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#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
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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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