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)
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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