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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#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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**  *  * * ****          *  *   ***  * *** *  ** **   * ****   *****      ****** ***         * ** * *  * * * *    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)
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   * **  **** * * *** ** * *******     * * *   **  * **  * * *  **  ** *  ** *  * ** *   * (-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);
*  ** * * *  *  * **  *  *** ** ***** ***  *  *** ** *
***  * *    * ** * ******* * **
    
*  **    ***   *  *** * **   * *      * *  *** ** ***   
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}
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 *  *  **  *
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* * * * **    ** ** **  *   ** * * *** ** **  *  *    ** - (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 = *  **  ** **     *  * ***
*   *******   *  *  **** *     *****  **  * ****   **  ******* **  *    }
     *** * *** ***    *    ** **  * ** ***  *   ***   *** **
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* ** ** **      ***  ** *** **   **   **  ** **  *   **   *********   * *****  **   *
*** *     ***         {
* *** *    *   *  **** **   ** *  * *     ****    **  * ********    **** ** *  **  *****  *  **     of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =  *  *** *  *  *    
*  * *     * * *  * **  *** **** ** *  * ** ** *** **   * ***    *  *    *  ****  
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** ***    ***    ****    *** ***** *      *   **  * *  **** ** *    *     ***  * *   * **
   *** *            {
 *  * *   * ****  * * *  * *    ** *  *    * *   *  **    ***** **** **  **     ** *** **  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)
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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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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