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>

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#include<stdlib.h>
#include<math.h>

int main(void)
{
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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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  *** *  * ******  ** * ** *** ** ***** *  * **   **     *        * * ** *    * **     * ***   **  ***         ***     *****  *   *** *  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
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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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