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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#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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*  **  **    * **  * **** ***   * * ** * *   **    ***  *  *  * ** *  *  ** ** *        * (-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)
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
-----------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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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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