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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#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)
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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
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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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