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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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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Hidden content!
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Hidden content!
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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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Hidden content!
#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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 *  ***  *   ***   *  * ** *  *** *  *   ******* * *  ***  ***  **  * ** ** **  *  *  * (-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)
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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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