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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#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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*** * * ** ** * *  **** 
*   * *****        *** 
  ** ****  *  **  
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
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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 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
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**  **** **   *  ** 
* **  *   * *** *******  
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 2: Correct output
Case 3: Correct output
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#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)
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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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