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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}
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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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*   *   ** * ****  **   * *****  * * *      ** *  *    
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 *   **  *** * ***  * **  *   ******  **  **   * ***   * ***     * *  *   * * **  * (-b+spD)/(2*a);
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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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