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
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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>

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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