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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#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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-----------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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