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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Hidden content!
#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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*      **** * *       * *    ** ******* ** *  * ** ** **     ***   * ** ** *  ** * *    **** **    * ** **** **  ** * 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
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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 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)
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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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