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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}
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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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}
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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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#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)
  **      * **  *       *  *  ******* **   * *  
  * * * *  *   * **    *    *****    ** *** *  *** *   * ****    *     *  ******** (-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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