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
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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: 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)
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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 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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