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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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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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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   *** **  * ***      ******   **   **** *****  *      * *** *** *  ** ***   *** ** (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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-----------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)
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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
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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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