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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}
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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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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)
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-----------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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