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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Hidden content!
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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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Hidden content!
#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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Hidden content!
#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)
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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
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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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