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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#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)
0 0
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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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