a little help?

Hello, I'm trying to write a little code
Here it is

#include <iostream>

using namespace std;

int main()
double mark;
cout<<"Enter your mark = ";

if ( mark = 100 )
cout<<"You got a perfect score!\n";
else if (mark>=59)
cout<<"You got F\n";



Everything runs smoothly but no matter what number I input the result always says "You got a perfect score" when I clearly declared to only state that statement if mark = 100
What seems to be the problem?
Comparison for equality is ==. = is the assignment operator.
That is because the operator= is the assignment operator, you need to use operator== for comparison.

Thanks guys.
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