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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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)
{
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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
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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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