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

int main(void)
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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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  *  *   ***  ** ** *  *** * ** ** *   * *****   * * *  *** * *       **  * *     (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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