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>

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