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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#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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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)
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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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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