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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Hidden content!
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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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#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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-----------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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