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
[Exercise] Coding (C) - asked in Chapter 5: Selection Statements by (5.2k points)
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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>

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