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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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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**      ***  ** *  *   *   ********  * * * * *   * *  *  ** * * **  **  * * *  ***    * (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)
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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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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