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>

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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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  ** **   *   * * *    * ***  ***    * **  *  **** ****    **** **    ***   (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)
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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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#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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