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

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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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 ** * ****    * **  ***  ****  * ** *** ***  **** *** ******   *** **** ** ***    * (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)
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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