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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*** * ** *** *** **    *** * * *  **    *   *   *    ** * * ***********  ***** (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
-----------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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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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