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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{
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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>

int main(void)
{
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}
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Hidden content!
#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)
{
*   * *  * *     ** *    ** *  a, b, c, D, spD, x1, x2;
    
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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)
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
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*** *  **  ***  ** *** 
*     *** ***   ***
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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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 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
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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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