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)
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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