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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#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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#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
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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)
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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