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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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 *   * *   *   * ****** ** *  *  * * *    * **  **    *** **     * ***   * (-b-spD)/(2*a);
  *  *****   *  * * *  ** **  **  *  *  * ******* ** * ********* ********  **  ** *  ***   (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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