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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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)
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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)
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Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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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
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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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