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)
{
 **   **   *  **** *  *     *   *  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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