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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}
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Hidden content!
#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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   * *      ******   *** ** ** *  * ***  *    ** *  *   **  **   *   ***    *    *   (-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
-----------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
-----------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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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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