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
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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>

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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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-----------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)
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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
-----------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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