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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Hidden content!
#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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***   *****  ** ***
  ** * **  ********   
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
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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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