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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 *   *** ****  *  * ** * ***  *   * * ** *  *** ** ***    * *   *  *  (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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