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