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

int main(void)
{
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}
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Hidden content!
#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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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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