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

int main(void)
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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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** *  ** **      ***  *     ***    * ** **   *  **** **     *  ***  ** ** *   * (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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