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)
ID: 28934 - Available when: 2017-10-26 18:00 - Due to: Unlimited
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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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#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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*  *** ***   * *    ***** *  *   * ******  *   *     ** *   *   * * *** **  ** ***** ** (-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)
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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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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