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

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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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  *  *     **   **  ****      *  *   *  * * ***** * **** ** ** **     ******   *   * * (-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)
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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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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