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