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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{
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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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}
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Hidden content!
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}
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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)
{
*  * *** *** ***    ** *** *  *  a, b, c, D, spD, x1, x2;
    
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    {
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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
-----------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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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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