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

int main(void)
{
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 ** *    *** ****  **    ****  * **  ** * * *  **    * * ****  ** ***   ** *  *   * (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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