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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Hidden content!
#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
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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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