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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}
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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)
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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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