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

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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)
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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
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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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