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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  *   * *   *     ** ***   *   *   *    **  *  *   * * *     *** *  **  *   * *  **  (-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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