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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*   **** *  * *******     **  **   ****  *** * * *   **   **  * ** *   * ** **** * **  ** *   **  **** **   *   *   *** * *   *** 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
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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 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
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**  ***  ** **  **** 
**** * ** * **    *  
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 2: Correct output
Case 3: Correct output
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#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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