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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#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)
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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