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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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
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}
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Hidden content!
#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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Hidden content!
#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)
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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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