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)
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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