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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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)
{
*   *  ** *  ***    *  * *  **   *** a, b, c, D, spD, x1, x2;
    
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****** ** * *** ** * **    *  *** ******* * ** **  **   *  * 
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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
-----------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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