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>

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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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)
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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#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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