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>

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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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 ** ** *  * *  * **** * * *  ** *  *  **   * *    ***  *  ***  ** * ** * * *  (-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)
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-----------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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