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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}
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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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#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)
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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)
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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