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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* *** ***  **  **** **    *   ******  **** * ***    ******** *     *  *    *  ***
     ***   ** *  *    **** *  ***  *  **    **  *** *   **    ** *** *  * *     **** * {
 *   * ** *  * *** * ***   *  *** * *  *** **    *** * **  *  ** *   *  ****  * *     **    ** **  *  **** ** ***** 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)
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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)
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: 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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