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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#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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*** ******  **   * **** * **   * * **      * *** *** *   * * ***  *** *** **      * (-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 = **     * *  * * *****
 *** * ** *** * ** * **   *  ****   *** **  **  * ****   *     }
*  ** **   *    **** *  ******      ***      **
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   *   ** *   *    *  **   {
   * * ***** ** *  * **  * ** ** *** *    **  *   *  *** *  *    * ****   ** *   * *      * ** **
 **  ****   ***** * *   *    **    ** **     * *  **  ***** ** * *   *  * *   *      **
  * ***     *    *       {
**    ** *   ***  ** **  **    ***** **** ****   ** * *  **    *  *** ***  *** *  * *  * *   * *   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)
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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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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