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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 **** * ***** ***     ******* *    *      *******  **  ***    ** * ** ***    **   * *    * * **  * *** *   *    **** 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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