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)
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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)
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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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