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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Hidden content!
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Hidden content!
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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)
{
* **    ** *    ********  * * **   a, b, c, D, spD, x1, x2;
    
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 *    **  **  * *    ***** ****    * *** *  * * *   *  ***** *** ******  *   **  {
*   * **    *  ***   **    **  *  * **  * *   * **  * ***   *   *    *      *   *   **** **     **   **    ***  *  * * *  *  * 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 = **        ***** **
* *** * *****  * * ** **    *** * **  *  * *  **   * * * ** **  *   ** }
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* *  *  ***          *** ******  **   * *****  *  * *  *  *  if(D==0)
**** *  *    ** *     {
 * *** * * *** ** *  ***  * * **** *    * *** *    *  * * ** ***    *   * * *   
 *     *********    * * *  * * * ** **** * * **  *** ***         ** *** * * *  *   * *  *****    
*** * *        *       {
 * * *     *  ******  *  * ****  *** *** *    ***   * **   * *   **   * **  ** * **      ****** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =      *** **   **  ** *
  **** ***      ***** ** *    ** ** ****  * *   *******  * ** ** *    *      * 
* * *** ***  ** ****   *       **** * **  ** ** *    * *  ** ** * **  *  * * **  **** ** ***  * 
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   *  *           {
* **  * *   *    *  *  ****  ****   ***   *****  *   **** *  ***  *****   ** *  ****** **      ***  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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