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>

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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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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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 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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