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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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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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  ******          * * **  * * **  * *  * * *** ****  ***  **  ***** **  *    *** (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)
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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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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
-----------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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