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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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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)
{
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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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