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)
{
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 ***  *****    ****   *  *   **    * * * ** *     * *  *  * *  *  **  *  ** *   *  ****** (-b-spD)/(2*a);
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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);
     *** * ** *** *   * *   ** ********* **** ** 
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**  ** ** *****   *  * **********  ** * * ***   **
*******   *  * *     *  *  *  **  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!
  *  * **  * * **** ** 
 * ***** *    *  
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int * * * * 
  **     *  *   **** **      a, b, c, D, spD, x1, x2;
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    **** * ** ** * ** *     ** ***  *    *  * *  *  * *    if (x1==x2){
****     ** *   ** * *  * ***   * **   **** ** *** ***   *   **          *  * **  ***   of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =  *      *  **********
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* ******* *  *   *   * ***** * * **   * *   * **    *  *  *** *     else {
  *  *  **   * * **  *  * ****  * ** *  ** **********  ** ***** **** * ** ** **  *    * *        ** * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and  *  ** * = %.2lf\nx2 = **   * **  *   ** *  *
* * *       **** * ****       ******   * **   ** **  *  ** ****     *   *  }
*    *        ***  ******   **  ***     * * ***   *        * 
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***   **  **  ****  ***    {
* **   *      *  * ** ***  * ** ***   **  **   ** * **  * *******  * * *  **   *  *  *  **  * **
* *  *     ** ** *  *           *     * *** * *** * *     ***     * *  **  *   * * * **
   ***   *  * * **       {
** ** *  **** * * ***** *** *  * **  * ****      * *   ***   ********  ** *   ** ****   * * of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =  *  *    ** ** 
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***  **** * ******  * * ********* ** *     * * *   * **    ***** *   **** *****
*     * **    ****  *  *   **   *   ***  ********  ***** *****  *     ** * *  ** 
   **            {
 * * * *** * **   *** **** ** **  **     ** ********   *** **    *  ** * ** * ****  ***** * * **   ****** 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) ) );
***   * * *** * **     *** **
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***    * ** * *  ***** *  ** * *   *** ********** **  * * * * *   *  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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