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

int main(void)
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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)
{
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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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