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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Hidden content!
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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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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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    {
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*  *     **  ** * * ** *  **    ******     * * *  *** *
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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)
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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
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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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