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>

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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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  * *   * ** **** *      * **     * *  **** ** **  *** ** *****  * **  *  ** *   ****  ***  ****    ***** ***   * 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);
* ** *   * *  *    ******  *  **   *  **  *  * ***    
****          *        
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**     * ** ******* *** * * ***     * ** **   *        * **  ** **      ***** *
 * **   * *   *   ***   * ** * *** *** *   *** ***  *  *    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
-----------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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