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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}
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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)
{
 ** ** * *  * ** * ** *  ** a, b, c, D, spD, x1, x2;
    
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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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