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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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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*   *   **** * ** * * *    **  *  **** *  * ***** *   *    * * **  ***   ***  *  (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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