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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Hidden content!
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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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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)
{
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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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