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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 *****  * *** *       ****  *  * * ***  **** %lf %lf", &a, &b ,&c)==3)
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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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