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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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)
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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