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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Hidden content!
#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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