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>

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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)
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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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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