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

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

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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)
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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