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>

int main(void)
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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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Hidden content!
#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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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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