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>

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}
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Hidden content!
#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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   *    **    ****** *    **** *     *       **  ****  *  *       * * (-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)
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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