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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Hidden content!
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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>

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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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    * * **  **  **  *  **  ***   **   *   **     * *  **    * *  * ****** *   * * ** * * * * * *  *  *  * * *  ***   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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-----------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)
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-----------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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