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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56 Answers

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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)
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-----------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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