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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****** *****   * * *    *  *  ***   * *  ****  * * ** ***** ** *****      *   *    (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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