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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#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 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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