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>

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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)
{
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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
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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