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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}
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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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-----------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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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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