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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#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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*  *  ***   ** *** * *  ***  ** ** * ** ****** * **  *** **** ***   (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
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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
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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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