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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}
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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)
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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)
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Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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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
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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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