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)
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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