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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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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#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
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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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