in the order of mathematical hierarchy gives me 410 and in the compilation of the code gives me 400 what should be the error?

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in the order of mathematical hierarchy gives me 410 and in the compilation of the code gives me 400 what should be the error?

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#1 by (4 votes)

1

#include <iostream>
#include <conio.h>
using namespace std;
 main() 
{ 
  double  x = ( 4 * 5 * ( 7 + ( 9 * 3 / ( 2 ) ) ) ) ;
  cout<<"el resultado de x es: "<<x;// el resultado es 400

  getch();  
}

c++ dev-c++

asked by edwin_ucli 22.11.2016 в 00:55

source

1 answer

run example from github library Problem counting correct answers

score 4 · Accepted Answer

All your operations are with integers, with which all the results are integers.

That means, that by dividing 27 / 2 you'll get 13 ( 13.5 is not an integer). So:

9 * 3 = 27
27/2 = 13
7 + 13 = 20
20 * 20 = 400

The simplest thing is to convert some number (the most internal you have), to floating point, that makes the arithmetic happen with floating point.

For example, you pass 3 to 3.0 , and you have left:

9 * 3.0 = 27.0
27.0 / 2 = 13.5
7 + 13.5 = 20.5
20 * 20.5 = 410.0

Another option is to make sure that the divisors are always floating numbers, since the source of the error is to use the entire division instead of the floating-point division.