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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#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)
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
-----------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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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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