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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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)
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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 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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