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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  ******  *  *** ***    **** *     **  ** *  * ** *      *** *     *** *   * ** (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)
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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 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
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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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