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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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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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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Hidden content!
#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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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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