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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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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