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)
{
 * * * **   * *   *   * **** * a, b, c, D, spD, x1, x2;
    
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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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