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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*    *  ****   **   *** ****** *   ** *        *****  *  ** *  * * **     *   *  ***** (-b-spD)/(2*a);
****   *****    **  * *  **  **  * *  * *  *   ****** *   ***   ***** *** **  * *    (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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-----------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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