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>

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

int main(void)
{
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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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#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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