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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}
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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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}
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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)
{
**  * ***   * * * ** *  ** **    *    a, b, c, D, spD, x1, x2;
    
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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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