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!
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#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)
{
**        * * **  *      ****    a, b, c, D, spD, x1, x2;
    
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* *** *    * *  * *    ** *   * *  ** * * *     ** 
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 * *   * *   ***  **     * ********* *  *  ***   *** ** ** *      *   *   * (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)
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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