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

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