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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  ***  *   ***  * * *  *  ****  * * ** **    ** ** * * * * * *  *  * *****  * *  (-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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