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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    *  *  *    *  * ***     *** *****   ** * *  *      *   * ***** *   ** ****  (-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)
0 0
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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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