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

int main(void)
{
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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)
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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)
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-----------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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