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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#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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*   **  * *  *  **** ****  * ** ****  *****  ** * *      ** **   * **  ** **  **   **  ** * *   **  **  ***   ***  * 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)
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-----------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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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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#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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