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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#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)
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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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