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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Hidden content!
#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)
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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