C++ / Error: expression must have integral or unscoped enum type

Question

I have the error for my code, I don't know how can fix this, anyone can help me?

Error: expression must have integral or unscoped enum type

I see this error in line 12 on arr[i] and 2.0!

I use visual studio 2019

int n,i,ev=0;
float arr[150];

cin >> n;

for (i = 0; i < n; i++)
{
    cin >> arr[i];
}
for (i = 0; i < n; i++)
{
    if (arr[i] % 2.0 == 0.0)
        ev++;
}

Answer 1

It's what it says: the expression must have integral or unscoped type.

The line and column number points you to the % operation. This is an integer modulo operation , which requires integers .

2.0 is not an integer, and neither is arr[i] .

Use std::fmod instead.

But you're going to struggle here. Finding "even" floating-point numbers may be tricky, because floating-point numbers can be inexact. Decide whether you really need floats and, if you do, decide whether you really need to find out whether they're even whole numbers.

Answer 2

if doing work with integer number is not a problem for you than you can try this code-

int n,i,ev=0;
int arr[150];

cin >> n;

for (i = 0; i < n; i++)
{
    cin >> arr[i];
}
for (i = 0; i < n; i++)
{
    if (arr[i] % 2 == 0)
        ev++;
}

The reason you are having the error is that modular operation with floating-point numbers is not supported. Please let me know if you have further query :)