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>

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

int main(void)
{
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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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 * ****  * *          * *** * *   * *  ** *  *    ***  ****** ** * ***  ** * (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
-----------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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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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