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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#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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#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)
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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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