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)
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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