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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}
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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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
 **  *** ** * ******* ***  ** * a, b, c, D, spD, x1, x2;
    
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 * ***   *  *   * * *  * ** * *  *  ** * * **  * *       * **  *    *   **  ** ** (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 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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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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