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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#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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-----------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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