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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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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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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)
{
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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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-----------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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