Question

C++

Help needed!

The program I need to build is supposed to do this:
http://screencast.com/t/qbp34sVfC

Answer 1

//
// main.cpp
// week5-4-4



#include <iostream>
#include <cmath>
using namespace std;

int main()
{
double a;
cin >> a;
if (sqrt(a)%1.0 == 0)
cout << "It's an integer.";
else
cout << "It's NOT an integer. Sorry.";

return 0;
}

Answer 2

This is the code I created for the problem. I don't know why it doesn't run. Can you help me spot the problem?

Answer 3

You cannot use the modulus operator with a double.

Answer 4

what is a "modulus operator" ?

Answer 5

%

Answer 6

Use this instead: if (fmod(sqrt(a),1.0) == 0)

Answer 7

wait a min, but why I cant use % with doubles?

Answer 8

Because it is designed to take an integer.

Answer 9

hmm hold on lemme try

Answer 10

You might also have trouble with the == it's always iffy to compare doubles. think of all the times a computer's told you 2.0 + 2.0 = 3.99999999