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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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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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{
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}
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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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}
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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
* * ****  ****  *  **    *******   a, b, c, D, spD, x1, x2;
    
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  ***** ** **    *  ** *** **  ****** *** **  ***  * * 
  ** * * ******  * *** ******  ** ** ***  * * * *   *  ** *    ** * ** ****       ** 
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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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-----------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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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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