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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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 * **** **  *  *  *     * ***  **  **  ** *  * * * *  ** *   **  **  * *  *      ** *** ** *     *****      **** ***  *   *** 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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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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*   * * ***    **   ** *
**     *** *  **
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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#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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