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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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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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#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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