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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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)
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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