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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#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)
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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