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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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)
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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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