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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}
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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)
{
 **** * *** * ** *  *   * * * a, b, c, D, spD, x1, x2;
    
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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)
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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