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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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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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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