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>

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)
{
*      ** *** ***  ** ***        a, b, c, D, spD, x1, x2;
    
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    {
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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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