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)
{
* *  **    *  *   *****  * * 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
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*** * ** **  ****** *  
* *** *** **  * ***
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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