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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****      ***        *** ** **  ****      * **   ** * ***  *   ***  *  * ** ******   *  **** *  * *    ***       ** 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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