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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* *  *  *    *  *  **** ********   ***   * * *    *  **** ***   ******  ** **** ** (-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 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
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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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