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

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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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    ** *****  * *    ** ******* *   * * * *   *** * * *** * **   **   *       **** *   *** *    ****** ****** ** ** **    *  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
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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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