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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}
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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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}
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Hidden content!
#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;
    
 *** *   *  ** *  **  ***  * *****  ******* %lf %lf", &a, &b ,&c)==3)
    {
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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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