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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}
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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)
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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 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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