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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